WIST

A strong mind is one which does not lose its balance even under the most violent excitement.

Karl von Clausewitz (1780–1831) Prussian soldier, historian, military theorist [Carl Philipp Gottlieb von Clausewitz]
On War, 1.3 (1832) [tr. J. Graham (1873)]

Courage is of two kinds: first, physical courage, or courage in the presence of danger to the person; and next, moral courage, or courage before responsibility, whether it be before the judgment seat of external authority, or of the inner power, the conscience.

Karl von Clausewitz (1780–1831) Prussian soldier, historian, military theorist [Carl Philipp Gottlieb von Clausewitz]
On War, 1.3 (1832) [tr. J. Graham (1873)]

Der Krieg ist nichts anderes als die Fortsetzung der Politik mit anderen Mitteln.
[War is not merely a political act but a real political instrument, a continuation of political intercourse, a carrying out of the same by other means.]

Karl von Clausewitz (1780–1831) Prussian soldier, historian, military theorist [Carl Philipp Gottlieb von Clausewitz]
Vom Kriege [On War] (1832)
Trans. O. J. Matthijs Jolles, bk. 1, ch. 1, sec. 24 (1943). Most translations use "continuation of policy."