A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.

Perfection is achieved, not when there is nothing more to add, but when there is nothing left to take away.

That is the hardest thing of all. It is much harder to judge yourself than to judge others. If you succeed in judging yourself, it's because you're truly a wise man.

A goal without a plan is just a wish.

It is only with the heart that one can see rightly; what is essential is invisible to the eye.

It is only with one's heart that one can see clearly. What is essential is invisible to the eye.