Those who have the privilege to know have the duty to act, and in that action are the seeds of new knowledge.

The thing for us to do is just to do our duty, and not worry about whether anybody sees us do it or not.

So long as there is death there will be sorrow, and so long as there is sorrow it can be no part of the duty of human beings to increase its amount, in spite of the fact that a few rare spirits know how to transmute it.

I think it's the duty of the comedian to find out where the line is drawn and cross it deliberately.

Be with a leader when he is right, stay with him when he is still right, but, leave him when he is wrong.

Always bear in mind that your own resolution to success is more important than any other one thing.