Here is another quote from J. C. Ryle's book, Holiness!
"You must not hastily conclude that a man has no grace merely because you see in him some corruption. . . . Let us be more quick to see grace and more slow to see imperfections! Let us know that, if we cannot allow there is grace where there is corruption, we shall find no grace in the world. We are yet in the body. The devil is not dead. We are not yet like the angels. Heaven has not yet begun."
1 Corinthians 10:12 - Wherefore let him that thinketh he standeth take heed lest he fall.
2 Corinthians 10:12 - For we dare not make ourselves of the number, or compare ourselves with some that commend themselves: but they measuring themselves by themselves, and comparing themselves among themselves, are not wise.
P. S. - I just realized that these two verses are in chapter 10 verse 12. One in 1 Corinthians and the other in 2 Corinthians.