What is your advice for one who has a harshness in his style of da'wah?

Question:
The questioner says: I am a young man who is a beginner in seeking knowledge and calling people to Allah, but I suffer from a harshness in my style when advising others, and I want to learn how to deal with people, so please direct me, may Allah reward you with good, to books from which I can benefit in this field?

Answer:
My brother, calling people to Allah requires knowledge first, so you must learn first. If you learn enough knowledge and have an understanding of what is lawful and forbidden and the rulings of the Shari'ah, then you call people to Allah with knowledge and insight. As for calling people when you do not have sufficient knowledge and saying, "Choose books for me," books are not enough. You must receive knowledge from scholars in whatever field you find them, whether in schools, institutes, colleges, and universities, or in the circles of the mosques. The important thing for you is to seek knowledge first before beginning the da'wah. Yes.