Sanctify the Lord God in your hearts.
1 Peter 3:15
Regardless of the opposition a believer may face in this world, he is always to affirm in his heart that Christ is Lord. He is to accept and acknowledge the Lord’s sovereignty and majesty, fearing only Him.
The believer who sanctifies Christ exalts Him as the object of his love and loyalty. He recognizes His perfection, magnifies His glory, and extols His greatness. He submits himself to God’s will, realizing that His will sometimes involves suffering. To live that way is to “adorn the doctrine of God our Savior in all things” (Titus 2:10).
As a Christian, you need to be committed to honoring Christ as Lord—even in the midst of suffering. Submission to Him will yield courage, boldness, and fortitude in the midst of hostility.
A Devotion to Christ
but sanctify Christ as Lord in your hearts, (3:15a)
Here the apostle again alludes to Isaiah 8:13, “Sanctify the Lord of hosts” (kjv). When believers sanctify Christ as Lord in their hearts, they affirm their submission to His control, instruction, and guidance. In so doing they also declare and submit to God’s sovereign majesty (cf. Deut. 4:35; 32:4; 1 Kings 8:27; Pss. 90:2; 92:15; 99:9; 145:3, 5; Isa. 43:10; Rom. 8:28; 11:33) and demonstrate that they fear only Him (Josh. 24:22–24; Pss. 22:23; 27:1; 34:9; 111:10; 119:46, 63; Prov. 14:26; Matt. 4:10).
Sanctify (hagiasate) means “to set apart,” or “consecrate.” But in this context it also connotes giving the primary place of adoration, exaltation, and worship to Christ. Believers who sanctify Christ set Him apart from all others as the sole object of their love, reverence, loyalty, and obedience (cf. Rom. 13:14; Phil. 2:5–11; 3:14; Col. 3:4; 2 Peter 1:10–11). They recognize His perfection (Heb. 7:26–28), magnify His glory (Acts 7:55–56; cf. Rev. 1:12–18), extol His pre-eminence (Col. 1:18), and submit themselves to His will (Mark 3:35; Rom. 12:2; Eph. 6:6; Heb. 10:36; 1 John 2:17), with the understanding that sometimes that submission includes suffering.
This honoring of Christ as Lord is not external, but in the hearts of true worshipers—even when they must face unjust suffering. That submission to and trust in the perfect purposes of the sovereign Lord yields courage, boldness, and fortitude to triumph through the most adverse situations.
A Readiness to Defend the Faith
always being ready to make a defense to everyone who asks you to give an account for the hope that is in you, yet with gentleness and reverence; (3:15b)
It is not just endurance through the blessing of suffering that believers are to submit to; there is also the opportunity to defend the truth when they are being persecuted. Christians must be ready to make a defense of the faith. The Greek term for defense (apologia) is the word from which the English terms apology and apologetics derive. It often means a formal defense in a judicial courtroom (cf. Acts 25:16; 2 Tim. 4:16), but Paul also used the word informally to denote his ability to answer those who questioned him (Phil. 1:16). Always indicates believers’ need for constant preparedness and readiness to respond, whether in a formal courtroom or informally, to everyone who asks them to give an account for why they live and believe the way they do. Account is simply logos, “word,” or “message,” and it calls saints to be able at the time someone asks (present tense) to give the right words in response to questions about the gospel.
The gospel is identified as the hope that is in believers. Hope is synonymous with the Christian faith because the motive for believers’ embracing Jesus Christ as Lord and Savior is their anticipation of escaping hell and entering eternal glory (cf. Acts 26:6; Eph. 1:18; 4:4; Col. 1:23; Heb. 10:23). Thus hope becomes the focal point of any rational explanation believers should be able to provide regarding their salvation. (For further insights into the meaning of hope, see the discussion of 1:3 in chapter 2 of this volume.)
The believer’s defense of this hope before the unbeliever who asks must be firm and uncompromising, but at the same time conveyed with gentleness and reverence. Gentleness refers to meekness or humility, not in the sense of weakness but in the sense of not being dominant or overbearing (cf. Eph. 4:15, “speaking the truth in love”). The Lord Himself was characterized by this virtue, as was Paul: “Now I, Paul, myself urge you by the meekness and gentleness of Christ” (2 Cor. 10:1a).
Reverence expresses devotion to God, a deep regard for His truth, and even respect for the person listening (Col. 4:6; 2 Tim. 2:24–26).
Christians who cannot present a biblically clear explanation of their faith (cf. 1 Thess. 5:19–22; 1 John 2:14) will be insecure when strongly challenged by unbelievers (cf. Eph. 4:14–15). In some cases that insecurity can undermine their assurance of salvation. The world’s attacks can overwhelm those who have not “put on the breastplate of faith and love, and as a helmet, the hope of salvation” (1 Thess. 5:8; cf. Eph. 6:10–17).
3:15 In the last part of verse 14 and in this verse, Peter quotes from Isaiah 8:12b, 13, which says: “Nor be afraid of their threats, nor be troubled. The Lord of hosts, Him you shall hallow; Let Him be your fear, and let Him be your dread.” Someone has said, “We fear God so little because we fear man so much.”
The Isaiah passage speaks of The Lord of hosts as the One to be reverenced. Quoting it, Peter by inspiration of the Holy Spirit, says, sanctify the Lord God in your hearts.
To reverence the Lord means to make Him the Sovereign of our lives. All we do and say should be in His will, for His pleasure, and for His glory. The lordship of Christ should dominate every area of our lives—our possessions, our occupation, our library, our marriage, our spare time—nothing can be excluded.
Always be ready to give a defense to everyone who asks you a reason for the hope that is in you, with meekness and fear. This applies primarily to times when Christians are being persecuted because of their faith. The consciousness of the presence of the Lord Christ should impart a holy boldness and inspire the believer to witness a good confession.
The verse is also applicable to everyday life. People often ask us questions which quite naturally open the door to speak to them about the Lord. We should be ready to tell them what great things the Lord has done for us. This witnessing should be done in either case with gentleness and reverence. There should be no trace of harshness, bitterness or flippancy when we speak of our Savior and Lord.
3:15 sanctify Christ as Lord in your hearts. The meaning is “set apart in your hearts Christ as Lord.” The heart is the sanctuary in which He prefers to be worshiped. Live in submissive communion with the Lord Jesus, loving and obeying Him—and you have nothing to fear. always being ready to make a defense. The Eng. word “apologetics” comes from the Gr. word here translated “defense.” Peter is using the word in an informal sense (cf. Php 1:16, 17) and is insisting that the believer must understand what he believes and why one is a Christian, and then be able to articulate one’s beliefs humbly, thoughtfully, reasonably, and biblically. the hope that is in you. Salvation with its anticipation of eternal glory.
3:15 “Sanctify” means “set apart.” Having established a special dwelling for God in the heart, the Christian ought to be ready always to give an answer to those who seek a reason for his hope. The word “defense” is apologia (Gk.), from which the English word “apology” is derived. However, closer to the intent of Greek thought is the idea of Christian “apologetics,” an organized, thoughtful defense of the faith. The believer’s task is to know well the truths of the faith and to prepare to present them in a persuasive fashion.
3:15 sanctify the Lord God: Believers should acknowledge the eternal holiness of Christ by revering Him as the Lord of the universe who is in control of all things. to give a defense: Peter assumes that the Christian faith will be falsely accused. He therefore encourages Christians to have rational answers to respond to those false accusations. Meekness is the same term translated gentle in v. 4. Meekness is not weakness. Scripture indicates that both Moses and Christ were meek men; however, they were certainly not weak men. Fear implies a high degree of reverence or respect.
3:15. In their hearts Christians are to set apart Christ as Lord. Alexander Maclaren wrote, “Only he who can say, ‘The Lord is the strength of my life’ can go on to say, ‘Of whom shall I be afraid?’ ” (Expositions of Holy Scriptures, 16:42) Christians should overcome fear by sanctifying (hagiasate, “make separate from others”) Christ as their Lord (kyrion). As a result Christians should always be prepared (hetoimoi, “ready”; cf. 1:5) to give … the reason (apologian, the “defense” which a defendant makes before a judge; cf. Acts 22:1; 25:16) for their hope in Christ. Such an oral defense should be consistent with one’s “set-apart” conduct.
3:15 sanctify the Lord God in your hearts: Be sure you are filled with His Spirit and have no attitude contrary to love. We should give our testimony with meekness (humility) toward others and with fear (reverence) toward God for what He has done. See article “Noah’s Ark.”
 MacArthur, J. (2001). Truth for today : a daily touch of God’s grace (p. 119). Nashville, Tenn.: J. Countryman.
 MacArthur, J. F., Jr. (2004). 1 Peter (pp. 200–202). Chicago: Moody Publishers.
 MacDonald, W. (1995). Believer’s Bible Commentary: Old and New Testaments. (A. Farstad, Ed.) (p. 2271). Nashville: Thomas Nelson.
 MacArthur, J. F., Jr. (2006). The MacArthur study Bible: New American Standard Bible. (1 Pe 3:15). Nashville, TN: Thomas Nelson Publishers.
 Criswell, W. A., Patterson, P., Clendenen, E. R., Akin, D. L., Chamberlin, M., Patterson, D. K., & Pogue, J. (Eds.). (1991). Believer’s Study Bible (electronic ed., 1 Pe 3:15). Nashville: Thomas Nelson.
 Radmacher, E. D., Allen, R. B., & House, H. W. (1999). Nelson’s new illustrated Bible commentary (p. 1685). Nashville: T. Nelson Publishers.
 Raymer, R. M. (1985). 1 Peter. In J. F. Walvoord & R. B. Zuck (Eds.), The Bible Knowledge Commentary: An Exposition of the Scriptures (Vol. 2, p. 850). Wheaton, IL: Victor Books.
 The Open Bible: New King James Version. (1998). (electronic ed., 1 Pe 3:15). Nashville: Thomas Nelson Publishers.