Advice for students of knowledge who neglect their lessons to read another book

The questioner : Your Eminence the Shaykh! I love you for the sake of Allah. To proceed: In the lecture halls, there are some students, and I may be one of them, who occupy themselves with reading a book outside of the lesson, or because the lesson is not beneficial, or because it is a bit boring, or because I find more benefit in the book than in what the professor says. What is your advice to me and to those like me?

The Shaykh : I say: May Allah love the one who loves us for His sake. As for occupying oneself with something other than the lesson being delivered, I see that it is not permissible, because you entered this university bound by a commitment.
This includes the specific study, so if you are distracted from it, you are not fulfilling the contract and the pledge. The closest view to me is that it is not permissible to occupy oneself with anything other than what the professor prescribes or explains. As for the lesson being boring, if a person allows himself to be bored by something, it bores him. But if he settles his heart on the fact that he must be present with his heart for it, the boredom will go away. As for the professor not providing a comprehensive explanation, this can be addressed. If the situation is like this for all the students, they can say to the teacher: We would like you to explain to us a more comprehensive explanation than this, or clarify it to us with a clearer clarification. These things can be eliminated through mutual advice and cooperation.