Thou canst [truly] warn only him who is willing to take the reminder to heart, and who stands in awe of the Most Gracious although He is beyond the reach of human perception: unto such, then, give the glad tiding of [God's] forgiveness and of a most excellent reward!

Thou canst but admonish such a one as follows the Message and fears the (Lord) Most Gracious, unseen: give such a one, therefore, good tidings, of Forgiveness and a Reward most generous.

Thou warnest only him who followeth the Reminder and feareth the Beneficent in secret. To him bear tidings of forgiveness and a rich reward.

Thou canst warn him only who follows the Reminder and fears the Beneficent in secret; so give him good news of forgiveness and a generous reward.

You can only warn one who follows the message and fears the Most Merciful unseen. So give him good tidings of forgiveness and noble reward.