“There are moments in Life when keeping silent becomes a fault, and speaking an obligation. A civic duty, a moral challenge, a categorical imperative from which we cannot escape.”

The Queen v. Instan (1893), L. R. 1 Q. B. [1893], p. 453.

On Soviet actions in Hungary to the UN General Assembly (21 November 1956)

Source: Twenty Years at Hull-House (1910), Ch. 16
Context: I have come to believe … that the stage may do more than teach, that much of our current moral instruction will not endure the test of being cast into a lifelike mold, and when presented in dramatic form will reveal itself as platitudinous and effete. That which may have sounded like righteous teaching when it was remote and wordy, will be challenged afresh when it is obliged to simulate life itself.

Netherseal Colliery Co. v. Bourne (1889), L. R. 16 Ap. Ca. 247.

Gantenbein (1964)

The Pragmatics of Patriotism (1973)
Context: Selfishness is the bedrock on which all moral behavior starts and it can be immoral only when it conflicts with a higher moral imperative. An animal so poor in spirit that he won't even fight on his own behalf is already an evolutionary dead end; the best he can do for his breed is to crawl off and die, and not pass on his defective genes.

Last sermon before being imprisoned by the Nazi regime of Germany (27 June 1937), as quoted in Religion in the Reich (1939) by Michael Power, p. 142

Kulturphilosophie (1923), Vol. 2 : Civilization and Ethics