When the world is at peace, a gentleman keeps his sword by his side.

Wu Tzu-Griffith,1977

The ways of the gentleman are three...in humanity, he has no anxieties; in wisdom, he has no confusion; and in courage he has no fear.

Master Kong, Analects.

If you do not study Poetry, you will not be able to speak. (16:13) ibid.

The arts of peace and the arts of war are like the two wheels of a cart which, lacking one, will have difficulty in standing.

Kuroda Nagamasa.