I realized that all the things he said are truth because in fact most of us, aren't be happy for all the things we have and all the time we complain about everything, when the truth is that many people have a really bad day or really bad problems but they're always positive and be grateful for all the things god give to them, in the video a listen a quote that makes me reflect "We cannot only have grateful experiences. We can be people who live gratefully.", so i think that is the truth, all depends the way you see the things.