Study the past if you would define the future.
Confucius, Analects
The superior man understands what is right; the inferior man understands what will sell.
When we see men of a contrary character, we should turn inwards and examine ourselves.
Shall I teach you about knowledge? What you know, you know, and what you don’t know, you don’t know. This is true wisdom.
In all things, success depends upon previous preparation, and without such preparation there is sure to be failure.
If a man takes no thought about what is distant, he will find sorrow near at hand.