Some Words From John Lennon

"When I was 5 years old, my mother told me the key to life is happiness. When I went to school, they asked me what I wanted to be when I grew up. I wrote down 'happy'. They told me I didn't understand the question. I told them I didn't understand life"

I thought that was a pretty smart thing to say. And as you've seen, John was a very smart man.