Looking deeper, we could say that the real cause of suffering is not being able to tolerate uncertainty—and thinking that it's perfectly sane, perfectly normal, to deny the fundamental groundlessness of being human.

Pema Chödrön

A wise man once said nothing.

Proverb

That which does not kill us makes us stronger.

Friedrich Nietzsche

When the well is dry, we know the worth of water.

Benjamin Franklin

Knowing others is intelligence; knowing yourself is true wisdom. Mastering others is strength; mastering yourself is true power.

Lao Tzu

The person who says it cannot be done should not interrupt the person who is doing it.

Chinese Proverb