Rancour

Ghill is a malady of the heart that is closely related to rancour, extreme anger, and malice. It comes from the same Arabic root from which the word aghlal originates, which is used in the Quran to mean yokes around the neck (Quran 36:8), as if to say that rancour dwells in a heart bound to rancour and treachery. Rancour is pungent emotion that is rooted in being extremely angry at a person to the point that one wishes harm to come to him. But the ultimate victim of rancour is its carrier.

Imam Mawlud says that if a person feels rancour toward a particular person, he should show that person goodwill. By nature, people are naturally inclined to love those who do good to them. And if one shows a person good, feelings of rancour will fall to the wayside.

If a person has rancour toward another believer, God shall not forgive that person until he forgives his brother, for rancour is a serious affliction that festers in one's heart and blocks good things from coming to one.

Compiled From:
"Purification of The Heart" - Hamza Yusuf, pp.122, 123