Don't give us your doubts, gives us your certainties, for we have doubts enough of our own.

To quit smoking, you must first want to quit, but then you must also do the quitting

Thinking is easy, acting is difficult, and to put one's thoughts into action is the most difficult thing in the world.

Against great advantages in another, there are no means of defending ourselves except love.

It is in self-limitation that a master first shows himself.

Treat people as if they were what they ought to be and you help them to become what they are capable of being.

Not art and science only, but patience will be required for the work.