Gems from the Quran

Do not be rude in speech (3:159)
Restrain anger (3:134)
Be good to others (4:36)
Do not be arrogant (7:13)
Forgive others for their mistakes (7:199)
Speak to people mildly (20:44)
Lower your voice (31:19)
Do not ridicule others (49:11)
Be dutiful to parents (17:23)
Do not say a word of disrespect to parents (17:23)
Do not enter parents’ private room without asking permission (24:58)
Do not follow anyone blindly (2:170)
Grant more time to repay if the debtor is in hard times (2:280)