Once you have tasted flight, you will forever walk the earth with your eyes turned skyward, for there you have been, and there you will always long to return.

The artist sees what others only catch a glimpse of.

I have been impressed with the urgency of doing. Knowing is not enough; we must apply. Being willing is not enough; we must do.

Learning is the only thing the mind never exhausts, never fears, and never regrets.

Time stays long enough for those who use it.

The noblest pleasure is the joy of understanding.

Learning never exhausts the mind.

Simplicity is the ultimate sophistication.