The folly and perhaps consequence of bitterness toward another person, especially a Christian, in any degree is that you waste your time doing something as base and unproductive as hating another person for something that they did in the past, which they have either become aware of and have changed or have not become aware of and therefore can not have changed.

Yet you, in your natural carnal state, would hold your feelings and pride tightly in your hands that are stained with the blood of your brother whom you could "give life to" by instructing him in his error as you hatefully sneer at everything that the one who "wronged" you does, rather than do what you should as one blood bought Christian to another, which is heed the words of John in his Epistle, which clearly states:

1Jo 2:9 The one claiming to be in the light, and hating his brother, is in the darkness until now.
1Jo 2:10 The one loving his brother rests in the light, and no offense is in him.
1Jo 2:11 But the one hating his brother is in the darkness, and walks in the darkness, and does not know where he is going, because the darkness blinded his eyes.

I have heard that anger is a temporary insanity, which blinds the eyes and numbs the minds of those whom It ensnares. These verses seem to back that theory up, if not in a perfectly literal sense. Surely we all know it is speaking of fellowship with God and non-fellowship with God, but let me ask you this: Which state are you in when you despise what your brother is doing without having the charity to correct him?

(Proverbs 10:12) Hatred stirs up fights, but love covers all transgressions.

(Proverbs 17:9) He who covers a transgression seeks love, but he who repeats a matter separates friends.

(1 Corinthians 13:7) Love quietly covers all things, believes all things, hopes all things, endures all things.

Love covers the transgression of the recipient thereof, if only in the mind of the one who loves or when the lover encourages others to think more highly of the sinning loved one if it is discussed publicly. This is easy to do; Much easier, I reckon, than the other thing we are commanded to do.

1Jo 5:16 If anyone sees his brother sinning a sin not unto death, he shall ask; and He shall give life to him, to the ones not sinning unto death. There is a sin unto death. I do not say that he should ask about that.

Perhaps I shouldn't place too much emphasis on this, but it says that "he shall", not that he might. Then again, you, dear reader, read that in a strictly literal sense in Matthew 1:21, as do I, so take it here in the same manner if you can stand the consistency, which you will be able to if your spiritual man is in control. Either way, the same point is revealed in James 5:16:

Jam 5:16 Confess your faults one to another, and pray one for another, that ye may be healed. The effectual fervent prayer of a righteous man availeth much.

Do it, siblings, do it! Don't allow me to languish in my sin all the while knowing that you could save me. If I or any other Christian posess any maturity at all, we will listen to you. I'm not saying I'll always do that which is perfectly good and mature in response, but let me assure you that you're doing that which is good and mature when you justly rebuke me. I can't see things from your perspective sometimes and at times my sense of empathy works better than at others. You've got to tell me or you had might as well leave me to die in my sin. Is that love?

1Jo 3:14 We know that we have passed from death to life because we love the brothers. The one not loving the brother remains in death.
1Jo 3:15 Everyone hating the brother is a murderer, and you know that every murderer does not have everlasting life abiding in him.
1Jo 3:16 By this we have known the love of God, because that One laid down His life for us; and on behalf of the brothers we ought to lay down our lives.
1Jo 3:17 Whoever has the means of life of the world, and sees his brother having need, and shuts up his heart of compassion from him, how does the love of God abide in him?
1Jo 3:18 My little children, let us not love in word, or in tongue, but in deed and in truth.

My sibling, if you have the means of telling me my sin, how can you shut up your heart of compassion from me, a sinning brother? Well, you can either hate me and hope I die in my sins or you can fear me, quench the Spirit of compassion that God has given you in your regeneration, and leave me to die from the arrow of sin working its way toward my heart, causing me hurt. Do you love me? If you do either of those, you show no evidence of love.

So, please don't let me waste away in my ignorance. Do what you know to be right. It can't hurt anything, but your pride.

Joh_13:34; Joh_13:35; Joh_15:12; Joh_15:17; Rom_12:10; Rom_13:8; Gal_5:13; Eph_4:2; 1Th_3:12; 1Th_4:9; Heb_10:24; 1Pe_1:22; 1Pe_3:8; 1Jo_3:11; 1Jo_3:23; 1Jo_4:7; 1Jo_4:11; 1Jo_4:12; 2Jo_1:5;

I hope you get the point, you. :-p

..and this is why you should like me.. :D ..not. ;-) You're only indebted to do so if your conscience demands it despite what your pride may "require" you to do. Think about it.