Leonardo da Vinci

Simplicity is the ultimate sophistication.

Learning never exhausts the mind.

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

Study without desire spoils the memory, and it retains nothing that it takes in.

The noblest pleasure is the joy of understanding.

Water is the driving force of all nature.

The greatest deception men suffer is from their own opinions.