I know Dr. Zakir Naik Sahab has lots of collection on Debates, Q & A among non-muslims and muslims , etc. but i think there are very quite few lectures of him in which he has given Islaahi sermons like how to concentrate in salah, what is the importance of acting on each and every sunnah, Importance of becoming hafiz, alim, etc., There are lakhs of Muslims around the world who are the great fans of Dr. Sahab. There are also many among my friends and relatives circle, but I have found many things in them. There are 4 people in my relatives who are greatest fan of Dr sahab but they have filled hatred feelings among themselves regarding their "OWN BLOOD". Do listening of debates and praising dr. sahab and telling see how he is reverting non-muslims ( no doubt he is doing that) will help to them to unite among themselves? No! I have one friend who is my classmate, he looks like dr. sahab, follow his way of giving speech, but one thing I found in him is that, he dont have good relation with his brother. I have not seen him talking with his own brother (who is my classmate as well). He has very calm nature Mashallah!. What do you people say about this ^ ?