FRUITFUL HEARERS WITNESS OBEDIENTLY (4:21–23)
In the parable of the soils, Jesus used good soil to represent believers who hear the gospel, receive it, and consequently bear lasting fruit. Christians demonstrate spiritual life by repenting and turning from sin (Matt. 3:8) to live in obedience to God through the power of the Holy Spirit (Eph. 5:18). Paul delineated the elements of spiritual attitudes in his letter to the Galatians, “The fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness, gentleness, self-control; against such things there is no law” (5:22–23). The apostle similarly addressed the behavior of believers in his command to the Colossians: “Walk in a manner worthy of the Lord, to please Him in all respects, bearing fruit in every good work and increasing in the knowledge of God” (Col. 1:10). Jesus Himself taught that those who abide in His love and submit to His Word will be fruitful (John 15:4–10). Though it can take many forms, spiritual fruit always consists of both joyful attitudes and acts of obedience to the Lord (cf. John 1:16; Eph. 1:3–8; 2:7–10; Phil. 1:11).
In this passage, the Lord’s specific emphasis was on the fruit that comes from being a faithful witness to Him. The parable of the soils focused on the recipients of the gospel, distinguishing between those who would ultimately reject the message and those who would genuinely embrace it. By contrast, these subsequent parables (in vv. 21–32) highlight the responsibility of the faithful hearer as an evangelist. As those who had received the gospel and accepted it, Jesus’ disciples would now be called to bear fruit by obediently proclaiming the message of salvation to others (cf. Rom. 1:13; Col. 1:3–6).
The Lord used a simple analogy to make this point. He was saying to them, “A lamp is not to be put under a basket, is it, or under a bed? Is it not brought to be put on the lampstand?” Terracotta lamps consisted of a small pitcher or saucer with a handle on one end. The pitcher would be filled with oil and a floating wick would be placed atop the oil. In order to maximize their radiance, lamps were set on lampstands or on shelves protruding from the wall, where their glow could radiate throughout the room unobstructed. For obvious reasons, no one would place a lamp under a basket or under a bed, thereby negating its purpose.
The point of Jesus’ analogy is clear: Those who have received the light of the gospel are not to conceal it; rather they are to let is shine for others to see. Throughout Scripture, light is variously used as a metaphor for truth (Pss. 36:9; 119:105, 130; Prov. 6:23; Acts 26:23; Eph. 5:9; 1 Thess. 5:5), holiness (Rom. 13:12), and spiritual life in Christ (John 1:4). In this analogy, however, Jesus used light to illustrate the message of the gospel. Faithful hearers have an obligation, beyond heeding the gospel themselves, to proclaim it to the world of sinners. Those who have been transformed by the good news are themselves to present that truth to others (cf. Rom. 1:8; 16:19; 1 Thess. 1:8). As Jesus explained in the Sermon on the Mount,
You are the light of the world. A city set on a hill cannot be hidden; nor does anyone light a lamp and put it under a basket, but on the lamp-stand, and it gives light to all who are in the house. Let your light shine before men in such a way that they may see your good works, and glorify your Father who is in heaven. (Matt. 5:14–16)
The Lord’s words served as a mandate for the disciples, who may have wondered if the proclamation of the gospel was still part of Jesus’ strategy for reaching the world. Though Jesus had earlier gone throughout Galilee plainly preaching the gospel (cf. Mark 1:14, 38), He was now speaking in parables. As He told His disciples, “To you has been given the mystery of the kingdom of God, but those who are outside get everything in parables, so that while seeing, they may see and not perceive, and while hearing, they may hear and not understand, otherwise they might return and be forgiven” (4:11–12). As noted earlier, Jesus’ parables were an act of divine judgment against the obstinate unbelief of the people, including the outlandish claim made by the religious leaders that He was empowered by Satan (3:22; cf. John 10:20). Recognizing the finality of their rejection, Jesus cut them off from any further truth by speaking to them in unexplained riddles and enigmas.
Perhaps the disciples, observing the shift in Jesus’ preaching strategy, wondered if they were also to obscure the gospel message as a judgment on Israel’s unbelief. That was not what the Lord planned for them to do. In a short time, He would send them out in pairs to preach the gospel (Mark 6:7–13; cf. Luke 9:1–6). Such was part of the preparation for their full commissioning after His resurrection (Matt. 28:18–20). As Jesus told His disciples before He ascended, “You will receive power when the Holy Spirit has come upon you; and you shall be My witnesses both in Jerusalem, and in all Judea and Samaria, and even to the remotest part of the earth” (Acts 1:8).
That the Lord did not intend for the gospel to be permanently obscured is made clear from verse 22. As the Lord told His disciples, “For nothing is hidden, except to be revealed; nor has anything been secret, but that it would come to light.” In other words, there was an occasion when the truth was hidden and obscured from some obstinate rejecters; there was coming an era when the hidden things were to be revealed, and the secret things disclosed to the world. That era of unveiling mysteries would commence with the preaching ministry of the apostles (starting while Jesus was still with them—cf. Matt. 10:26), continue on the other side of the Great Commission, and last until His return (Matt. 24:14).
Jesus’ words in verse 22 may have also included an admonition about the reality of spiritual hypocrisy. In Luke 12:1–2, Jesus used this same expression as a warning against the hypocrisy of the Pharisees: “Beware of the leaven of the Pharisees, which is hypocrisy. But there is nothing covered up that will not be revealed, and hidden that will not be known.” In the parable of the soils, Jesus described two types of people who initially respond enthusiastically to the gospel but later prove to be false converts. The Lord compared those individuals to soil that was either rocky or infested with thorns. As the disciples considered their evangelistic task, they may have wondered how they would be able to distinguish between spiritual hypocrites and genuine believers. Jesus’ words assured them that, given enough time, the truth would come to light. In the short term, false converts might be undetected, but eventually the hidden reality of their hearts would become evident.
Whatever the response to their gospel proclamation, the disciples were to faithfully disseminate the message. The seed of saving faith in their hearts was to produce the fruit of gospel witness. That evangelistic mandate did not end with the apostles. It began with them and has fallen on all believers, in every generation of church history. Christians are called to eagerly “proclaim the excellencies of Him who has called [them] out of darkness into His marvelous light” (1 Peter 2:9). Jesus’ statement, “If anyone has ears to hear, let him hear,” repeated the truth of Mark 4:9 and underscored the importance of what He had just said. It was imperative that the disciples carefully consider the implications of being a diligent and, therefore, fruitful hearer.
MacArthur, J. (2015). Mark 1–8 (pp. 212–215). Moody Publishers.
21–23 Mark’s statement erchetai ho lychnos (lit., “does the lamp come …”) is unusual, for erchetai normally has a personal subject. This construction, together with Mark’s use of the definite article (ho), has suggested to some that the lamp here refers to Jesus himself (cf. Lane, 165–66; Cranfield, 164; Hooker, 133). The other possible interpretation is that the lamp refers to the message of the kingdom of God, the coming of which Jesus has been proclaiming (cf. France, 208). Both interpretations fit the context, since Jesus and the kingdom have appeared now in a veiled or hidden manner but will be fully revealed in the future. The two ideas are in fact very close since, as Lane, 166, points out, “the secret of the Kingdom of God … is present in the person of Jesus.” Furthermore, the return of the Son of Man in glory is associated with the consummation of the kingdom (13:26–27).
The purpose of the lamp (lychnos) is to be put on a lampstand and not under a bowl (modios) or a bed. A lychnos is a clay lamp filled with oil. A modios is a grain measure holding about two gallons. The bed (klinē) could be a bed or a dining couch. In Matthew the saying appears in the Sermon on the Mount and refers to the good deeds Jesus’ disciples should shine on the world. Here, as the following proverbs explain, the point is that the present hiddenness of Jesus and the kingdom will not always be. Hidden things are meant to be brought into the open (v. 22). It is not made explicit who the revealer is (God, Jesus, the disciples?) or when the revelation will take place. The revealer and revelation could be the glorious return of Christ and the consummation of the kingdom, or the disciples and their proclamation of the gospel following Jesus’ death and resurrection. The latter fits well with Jesus’ command to his disciples in 9:9 that his glory, revealed at the transfiguration, should not be proclaimed “until the Son of Man had risen from the dead.” In either case, the statement balances the secrecy motif that runs throughout Mark’s gospel. Though at present Jesus guards his identity and privately explains the secret of the kingdom of God to his disciples, this hiddenness is temporary and is simply the means by which God is accomplishing his salvific purpose. The time will come when all such mysteries will be revealed and the glory of Christ and the kingdom will be evident to all.
As with the parables, such teaching requires spiritual discernment, so the exhortation of 4:9 is repeated: “If anyone has ears to hear, let him hear” (v. 23).
Wessel, W. W., & Strauss, M. L. (2010). Mark. In T. Longman III & D. E. Garland (Eds.), The Expositor’s Bible Commentary: Matthew–Mark (Revised Edition) (Vol. 9, pp. 759–760). Zondervan.

