إِنَّ ٱلَّذِينَ يَتْلُونَ كِتَـٰبَ ٱللَّهِ وَأَقَامُوا ٱلصَّلَوٰةَ وَأَنفَقُوا مِمَّا رَزَقْنَـٰهُمْ سِرًّا وَعَلَانِيَةً يَرْجُونَ تِجَـٰرَةً لَّن تَبُورَ

The man of knowledge is one who experiences a deep realization of God (ma‘rifah) and one who attains this state, makes the Book of God, a guide in his thinking processes; he becomes a pious subject of God. Moreover, he becomes so kind to his fellow human beings that he sets apart a share from his hard-earned income for them. He gathers the courage to devote himself body and soul to God’s tasks and is content with the knowledge that he will be rewarded in the Hereafter. One of the proofs of the Quran being true is that it tallies exactly with forecasts made in the previous divine scriptures. If a man is serious and sincere, this very fact will be enough to make him have faith in Quran.

— Source: Tazkirul Quran (Maulana Wahiduddin Khan) via Quran.com (35:29)