Al-Khateeb al-Baghdaadee (rahimahullaah) said: “It is fitting that he takes care in acquiring knowledge and that he should not take too much in one go. Rather, he should take a little at a time, such that he can bear it., memorize it and be able to understand it. Because Allaah says:

 ”And those who disbelieve say: Why is the Qur’aan not send down to him all at once? Thus (is it sent down in parts) that We may strengthen your heart thereby.  And We have revealed it to you gradually, in stages.”

 25:32

He (rahimahullaah) also said: “And know that the heart is an organ from the organs.  It is able to bear some things and unable to bear others-just like the rest of the body.  Thus, some people are able to carry one-hundred pounds, whereas others are unable to carry even twenty. Some people are able to walk a number of miles in a day without tiring, whereas others are unable to even walk a mile a day before they become tired…So let each person limit himself to what he is able without expending all his energies, because that will better aid him in learning with a good mind, from a firm and proficient teacher.”

{Al-Faqih wal-Mutafaqqih 2/101 & 107} 

Haneefah