Good men are bad men's instructors, And bad men are good men's materials.
Laozi (1959). “Tao TĂȘ Ching: A New Translation”
![Good men are bad men's instructors, And bad men are good men's materials.](http://cdn.quoteddaily.com/images/laozi/good-men-are-bad-mens-instructors-and-bad-men-are-good-mens-materials.jpg)
Good men are bad men's instructors, And bad men are good men's materials.