"When I was 5 years old, my mother always told me that happiness was the key to life..."

When I was 5 years old, my mother always told me that happiness was the key to life.  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 assignment, and I told them they didn’t understand life.  - John Lennon