Sir Terence David John Pratchett (28 April 1948 – 12 March 2015) was an English humorist, satirist, and author of fantasy novels, especially comical works. He is best known for his Discworld series of 41 novels.
You may find more from Terry Pratchett on Wikiquote
It is my opinion that humans are largely what they make of themselves; in other words, "human nature" is not so much an empirical reality as a process of self-construction. This means that if people become what they think they are, what they think they are is exceedingly important.