It was F.B. Meyer, I believe, who once said that when we see a brother or sister in sin, there are two things we do not know: First, we do not know how hard he or she tried not to sin. And second, we do not know the power of the forces that assailed him or her. We also do not know what we would have done in the same circumstances.
Stephen Brown, Christianity Today, April 5, 1993, p. 17.
The point is not to ignore or tolerate the sin of a brother. Paul admonished the Corinthians for their acceptance of immorality into the church, (cf. 1 Corinthians 5), and instructed them to “deliver such a one to Satan.”
However, that same individual, upon his repentance, received Paul’s pity. “Therefore I urge you to reaffirm your love to him” (2 Corinthians 2:8).
Our approach to the sinner should be one of humility and compassion, even as we seek to discipline him in his sin. “Brethren, if a man is overtaken in any trespass, you who are spiritual restore such a one in a spirit of gentleness, considering yourself lest you also be tempted” (Galatians 6:1).