You can read the full news article here: http://www.independent.co.uk/news/people/pope-francis-issues-top-10-tips-for-happiness-9639488.html
What did Jesus say? And He said to them, "Go into all the world and preach the gospel to every creature." (Mark 16:15). It may not bring the most happiness, people might persecute and even kill you, but it is what Christ has commanded of His disciples. Who are we going to listen to, the Pope or the Lord Jesus Christ? I think the answer is obvious -- Jesus!