The only way to do great work is to love what you do.
To invent, you need a good imagination and a pile of junk.
The true sign of intelligence is not knowledge but imagination.
The only limit to our realization of tomorrow will be our doubts of today.
We don't stop playing because we grow old; we grow old because we stop playing.
You can't stop the waves, but you can learn to surf.
The most wasted of all days is one without laughter.