Guiding the Professors in Da'wah and Clarifying the Criterion of the Middle Path

Question:
In the name of Allah, the Most Gracious, the Most Merciful. Praise be to Allah, and may blessings and peace be upon His servant and our chosen Prophet Muhammad, and upon his family and companions. We thank the honorable Shaykh, Your Eminence Shaykh Salih al-Fawzan (may Allah preserve him), for this gracious presence. We ask Allah the Exalted to place it in the scale of his good deeds. Your Eminence, I actually have two points on which I would like your comment. The first is that, as you know, Hail University has various colleges, including scientific colleges, with professors and teaching staff. A considerable number of them attend with us, teaching various subjects in different specializations. We truly want to send a message to these distinguished teachers to take on the burden of da'wah (calling others to Islam), guidance, and the education of the students. Perhaps some professors think that calling to Allah the Mighty and Sublime and providing proper educational guidance to students is the task of the Islamic culture teachers alone, even though Islamic culture is a fundamental subject in the university curriculum. But when guidance comes from a human medicine teacher, or when advice comes from an engineering teacher, it has a great impact on the students. So we ask for your guidance on this matter. The second point is one we would like to hear, which is clarifying the correct criterion of the middle path. The middle path is a methodology that every person claims; every person who comes with an idea or an opinion or performs an action says, for example, "This is the middle path." The reference for this humble person is scholars like you, to clarify what the methodology or the correct criterion is by which matters are regulated in the middle path in words and actions. Thank you for your presence, Your Eminence. We ask Allah the Exalted for you a long life with good deeds. And may Allah send blessings and peace upon His servant...

Answer:
May Allah bless you. The answer to the first point, which is calling to Allah from every teacher: We say yes, every Muslim. Every Muslim must carry the da'wah to Allah according to his ability and provide guidance.
Every Muslim is required to do so, whether he is a teacher or not, but the teacher in particular has a greater responsibility to guide the students, especially if he sees something in them that requires attention; then he alerts them. Every teacher, whether in the science of medicine, who studies medicine and sees clear observations regarding his students, clarifies them to them and advises them.
Likewise, scholars have an even greater obligation to clarify the error to the students and others with evidence. As for the one who does not have knowledge, it is sufficient for him to guide in the apparent matters he sees in the students, such as a flaw in his clothing, laziness in his prayer, and so on. As for the scholar, he clarifies all the shubhah (doubtful matters) and clarifies the errors in words, explaining that to them.
As for the middle path, it is what the Messenger of Allah (peace and blessings be upon him) and his Companions were upon. He (peace and blessings be upon him) answered this question by saying: "This Ummah will split into seventy-three sects, all in the Fire except one." They said: "Who are they, O Messenger of Allah?" He said: The middle path is what the Salaf (the earliest generations) of this Ummah were upon, from the Companions and the Tabi'un (the generation after the Companions) and those who came after them from the guiding Imams. This is the middle path. Yes.