"There are things known and there are things unknown, and in between are the doors of perception."

"Medical science has made such tremendous progress that there is hardly a healthy human left."

"Experience is not what happens to a man; it is what a man does with what happens to him."

"The people who are going to make a difference are the ones who are not afraid to be ridiculous."

"The secret of genius is to carry the spirit of the child into old age, which means never losing your enthusiasm."