Forgive And Forget

This is the most powerful aid to peace of mind.
We often develop ill feelings inside our heart for the person who insults us or harms us.
We nurture grievances.
This in turn results in loss of sleep, development of stomach ulcers, and high blood pressure.
This insult or injury was done once, but nourishing of grievance goes on forever by constantly remembering it.
Get over this bad habit.
Life is too short to waste in such trifles.
Forgive, Forget, and march on.
Love flourishes in giving and forgiving.

Avoid . . .

Avoid becoming involved in matters you know nothing of,
And pursue not that of which thou hast no knowledge; for every act of hearing, or of seeing or of (feeling in) the heart will be enquired into (on the Day of Reckoning). (17:36)

Avoid grave sins and shameful deeds,
Those who avoid enormities of sin and abominations, save the unwilled offences – (for them) lo! thy Lord is of vast mercy. He is Best Aware of you (from the time) when He created you from the earth, and when ye were hidden in the bellies of your mothers. Therefor ascribe not purity unto yourselves. He is Best Aware of him who wardeth off (evil). (53:32)

Avoid guesswork about one another,
O ye who believe! Shun much suspicion; for lo! some suspicion is a crime. And spy not, neither backbite one another. Would one of you love to eat the flesh of his dead brother? Ye abhor that (so abhor the other)! And keep your duty (to Allah). Lo! Allah is Relenting, Merciful. (49:12)

Avoid being unjust in your opinions, (Be just in your opinions)
And approach not the wealth of the orphan save with that which is better, till he reach maturity. Give full measure and full weight, in justice. We task not any soul beyond its scope. And if ye give your word, do justice thereunto, even though it be (against) a kinsman; and fulfil the covenant of Allah. This He commandeth you that haply ye may remember. (6:152)

References from Qur’aan