It is reported that ‘Umar b. Al-Khattāb – Allāh be pleased with him – said:

We were once in a time when we did not think anyone learned the Quran seeking anything  but Allāh the Exalted, but now I fear there are men who learn it and intend the people and what they can get from them. So seek Allāh with your recitation and deeds. For verily, we used to know you when Allāh’s Messenger – Allāh’s peace and blessings be upon him – was amongst us, when revelation would descend and Allāh would tell us about you. As for today, Allāh’s Messenger – peace and blessings be upon him – has passed on, and the revelation has stopped; and I only know you as I say: whoever shows what is good, we love him for it and think good of him, and whoever shows what is evil, we hate him for it and suspect him. Your secret and private matters are between you and your Lord the Mighty and Majestic.

Al-Ājurrī, Akhlāq Ḥamalat Al-Qur`ān article 26.