This book is very interesting and relevant. He explained the influence we can have on others through selfless and sincere attitude. It's a very human vision of human relationships. There are plenty of clear advice. However I take one star because I find that some passages are quite tedious to read and not necessarily within the reach of everyone. But what is certain is that the pages you really learn a lot and our vision of social relations is bound to evolve positively. I recommend this book.