When we've been wronged, it is very difficult to overcome feelings of animosity and revenge. As the saying goes, "revenge is sweeter than honey." It takes great strength of character to overcome the natural desire for revenge and instead to forget the entire matter and remove it from one's heart as if it had never occurred.
Such a level is easy only for angels who do not have normal human emotions, but not for ordinary mortals. Nevertheless, the Torah states this obligation explicitly: "Do not hate your brother in your heart. Do not take revenge and do not bear a grudge." (Leviticus 19:17,8)
Today, ask yourself: Is there anyone toward whom I feel resentment, animosity or a grudge? If yes, imagine being able to let those feelings melt away. Experience yourself being free from the burden of those heavy feelings. Forgive!!! Allow yourself to feel the relief and lightness of living in the present - totally free from those counterproductive thoughts and feelings.
(see Rabbi Moshe Chaim Luzzatto - Path of the Just, ch.11)