If you do not smile, you are judged lacking in a 'pleasing personality' - and you need to have a pleasing personality if you want to sell your services, whether as a waitress, a salesman, or a physician.

I shall become a master in this art only after a great deal of practice.

There is no meaning to life except the meaning man gives his life by the unfolding of his powers.

The successful revolutionary is a statesman, the unsuccessful one a criminal.

Equality today means ‘sameness’, rather than ‘oneness’.

Human history begins with man's act of disobedience which is at the same time the beginning of his freedom and the development of his reason.

Critical and radical thought will only bear fruit when it is blended with the most precious quality man is endowed with - the love of life