Learning without thought is labor lost.

Chi Wen Tzu always thought three times before taking action. Twice would have been quite enough.

Learning without thought is labor lost; and thought without learning is perilous.

If a man take no thought about what is distant, he will find sorrow near at hand.

Learning without thought is labor lost; thought without learning is perilous.

Faced with what is right, to leave it undone shows a lack of courage.