Remind people gently
A scholar came to Haroon ar-Rasheed to admonish him and he did it in a harsh way.
Afterwards, Haroon was amazed and said: Surely, Allaah sent someone much more pious than you to warn a bigger sinner than me (i.e. Moosa to Pharaoh) and Allaah commanded him to be gentle!
● [Mukhtasar Tareekh Dimashq 8/115]