A person should not think that repentance is only necessary for sins that involve speech or deeds, such as slander, idolatry, promiscuity, or theft. Rather, just as a person is obligated to repent from those types of sins, similarly, he must search out and strive to correct his bad character traits, whether he has them inherently or he learned them from others. He must turn away and repent from anger, hatred, envy, frivolity, greediness, honor-seeking, gluttony and the like.
These bad character traits are more difficult to abandon and repent for than those that involve deeds. If a person is attached to any of these bad traits, it is more difficult for him to separate himself from them. In this context it says, “May the wicked abandon his path, and the crooked man his designs, and he should return to God and He will have mercy on him, and to God, for His forgiveness is bountiful.” (Seven Gates of Righteous Knowledge by Rabbi Moshe Weiner and Dr. Michael Schulman, Ask Noah International, 2017, p 152)