Which Method Manhaj of Dawah is best:Abul Hasan Ali Nadvi on Metodology Nahaj of Islah and Tableegh

Another Topic Of Mulims Controversy and Debate is How to do Islah/Dawah Work.
Muslim organisatios and people attached with them often argue in it.Which Manhaj/Methodology is correct
..Article written by Mufakkirul Islam Faisal Award winner Hazrat Maulana Abul Hasan Ali Nadvi from Book Tableeg e deen ka ek Usool.