Source: Al Capone Does My Shirts
“If something or someone makes you happy and brings joy to your life, it does not have to make sense to anyone else.”
1978
Related quotes

“Allowing someone else to make us happy will make them happy too.”
Source: Manuscript Found in Accra

Patheos, Anti-theist Answers to Christian Questions http://www.patheos.com/blogs/reasonadvocates/2015/11/22/anti-theist-answers-to-christian-questions/ (November 22, 2015)
“Decide what makes you happy and damn what anyone else thinks or says”
Source: Rush

Private comment, as quoted in Name-Dropping (1999) by John Kenneth Galbraith, p. 149.

Original: La vita di qualcuno, la rendi felice dicendogli sinceramente "ti amo", "mi manchi", dedicandogli attenzioni e trasmettendogli la gioia che provi ogni giorno... per la sua esistenza.
Source: prevale.net