Let him who would move the world first move himself.

The true measure of our success in forestry will be what we leave for future generations, not just our quarterly reports.

Rien n'est plus puissant qu'une idée dont l'heure est venue.

The only thing that interferes with my learning is my education.

We choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard, because that goal will serve to organize and measure the best of our energies and skills, because that challenge is one that we are willing to accept, one we are unwilling to postpone, and one which we intend to win, and the others, too.

We are what we pretend to be, so we must be careful about what we pretend to be.

绘画不是一个人所看到的，而是一个人能让别人看到的。