He only moves toward the perfection of his art whose criticism surpasses his achievement.

Leonardo da Vinci

Stress is caused by being “here” but wanting to be “there”.

Eckhart Tolle

Patience you must have, my young padawan.

Yoda

Science can flourish only in an atmosphere of free speech.

Albert Einstein

As iron is eaten by rust, so are the envious consumed by envy.

Antisthenes

It is impossible for a man to learn what he thinks he already knows.

Epictetus