2 Timothy 2:23-24
Don't have anything to do with foolish and stupid arguments, because you know they produce quarrels. And the Lord's servant must not quarrel; instead, he must be kind to everyone, able to teach, not resentful

Psychologist James J. Messina recommends five steps to facing and resolving resentful feelings. (1) Identify the source of the resentful feelings and what it is the person did to evoke these feelings, (2) develop a new way of looking at past, present and future life, including how resentment has affected life and how letting go of resentment can improve the future, (3) write a letter to the source of the resentment, listing offenses and explaining the circumstances, then forgive and let go of the offenses (but do not send the letter), (4) visualize a future without the negative impact of resentment, and (5) if resentful feelings still linger, return to Step 1 and begin again.