Darkness within darkness. The gateway to all understanding.

Lao Tzu

Travel and change of place impart new vigor to the mind.

Seneca

We become what we habitually contemplate.

George Russell

It is unwise to be too sure of one's own wisdom. It is healthy to be reminded that the strongest might weaken and the wisest might err.

Mahatma Gandhi

In all affairs, it's a healthy thing now and then to hang a question mark on the things you have long taken for granted.

Bertrand Russell

Nothing external to you has any power over you.

Ralph Waldo Emerson