Talmud.
397.
It is not enough to know; we must apply what we know. It is not enough to will; we must also act.
Goethe.
398.
Words of blame from those who are hostile to a great man cannot injure him. The moon is not hurt when barked at by a dog.
Arabic.
399.
The value of three things is justly appreciated by all classes of men: youth, by the old; health, by the diseased; and wealth, by the needy.
Omar Khayyām.