فَذَكِّرْ إِنَّمَا أَنتَ مُذَكِّرٌ ۝ لَّسْتَ عَلَيْهِمْ بِمُصَيْطِرٍ

Calling people to God aims at exhorting people through peaceful persuasion, to make them realize their Creator, the one and only God; to understand the purpose of their creation; the coming of the Hereafter, of their accountability to their Creator, etc. The purpose of this exhortation is to awaken souls from their slumber. It is to put a lost person on to the right path leading towards God. It is to awaken man’s insight so that he begins to see glimpses of God in the signs of the vast universe. It is to unveil the Creator in the mirror of His creation.

— Source: Tazkirul Quran (Maulana Wahiduddin Khan) via Quran.com (88:21)