Da`i ilallah

And who is better in speech than he who invites men to Allah and does good works and says, ‘I am surely of those who submit?’

And good and evil are not alike. Repel evil with that which is best. And lo, he between whom and thyself was enmity will become as though he were a warm friend.

But none is granted it save those who are steadfast; and none is granted it save those who possess a large share of good.

(Ch. 41 Verses 34-36)