9فَذَكِّر إِن نَفَعَتِ الذِّكرىٰAli UnalSo remind and instruct (them in the truth), in case reminder and instruction may be of use.1The Qur’ān says that instruction and reminding will be of use to the believers (51: 55), and one who stands in awe of God will receive instruction and admonition (this occurs in the next verse in this sūrah). And the Messenger is told to withdraw from those who decisively turn away from God’s Book and remembrance, and who aim at and desire nothing but the life of this world (53: 29). So, an instructor or preacher should observe whether instructing or preaching will be of use, and in what circumstances and for whom it will be of use. However, it should also be pointed out that instruction and preaching will never be rendered useless, particularly when done by sincere people like the Prophets. So the verse also implies that we should try to give constructive instructions and preaching.