The heart is deceitful above all things, and desperately wicked; who can know it?—Jeremiah 17:9.
NOBODY knows what is in the human heart but Christ. We do not know our own hearts; none of us have any idea how bad they are. Some bitter things have been written against me, but I know a good many more things about myself that are bad than any other man. There is nothing good in the old Adam nature. We have got a heart in rebellion against God by nature, and we do not even love God unless we are born of the Spirit.
This is a truth that men do not at all like, but I have noticed that the medicine that we do not like is often the medicine that will do us good. If we do not think we are as bad as the description, we must just take a closer look at ourselves.
 Moody, D. L. (1900). The D. L. Moody Year Book: A Living Daily Message from the Words of D. L. Moody. (E. M. Fitt, Ed.) (p. 38). East Northfield, MA: The Bookstore.