Give thy thoughts no tongue.

Know well what leads you forward and what holds you back, and choose the path that leads to wisdom.

The more I see the less I know for sure.

Speak only if it improves upon the silence.

We can know only that we know nothing. And that is the highest degree of human wisdom.

Long is the night to him who is awake; long is a mile to him who is tired; long is life to the foolish who do not know the true law.