The First Benefit: Correcting the Tongue and the Pen.

The Shaykh : Among its benefits are correcting the tongue and correcting the pen. Correcting the tongue is in speech, and correcting the pen is in writing. As for speech, people are excused when they converse with one another in the colloquial language, because if you were to address a common person in formal Arabic, he would say, "This is a foreigner," for they do not understand formal Arabic except in rare cases. However, writing—writing that follows grammar—is the important matter for students of knowledge. This is because some students write answers to questions or other things, or research papers, and you find in their work grammatical errors such that you can hardly say they are in the beginning of their studies, even though they may obtain a high degree after a month or two. This is a trial, a trial of what we are living through today.
It is regrettable that when some students speak about hadith, or speak about jurisprudence, or speak about exegesis, you find their speech good. But when they speak or write, you find they have broken sentences. Yes, perhaps they say: "The hen laid the egg." Yes... we do not say it this way. They make the hen the egg for the egg, and you find strange things.
For this reason, I see that it is obligatory for students now; it is obligatory for them to learn grammar and to practice their tongues and their pens with it, so that they do not... or so that their reputation does not become bad among people.