So long as my voice can be heard on this or the other side of the Atlantic, I will hold up America to the lightning scorn of moral indignation. In doing this, I shall feel myself discharging the duty of a true patriot; for he is a lover of his country who rebukes and does not excuse its sins. It is righteousness that exalteth a nation while sin is a reproach to any people.
One cannot suppress a certain indignation when one sees men’s actions on the great world-stage and finds, beside the wisdom that appears here and there among individuals, everything in the large woven together from folly, childish vanity, even from childish malice and destructiveness.
Immanuel Kant, Idea for a Universal History from a Cosmopolitan Point of View (1784)
True compassion is more than flinging a coin to a beggar. A true revolution of values will soon look uneasily on the glaring contrast of poverty and wealth with righteous indignation. It will look across the seas and see individual capitalists of the West investing huge sums of money in Asia, Africa, and South America, only to take the profits out with no concern for the social betterment of the countries, and say, "This is not just."
The Greeks have a word for indignation at another’s unhappiness: this affect was inadmissible among Christian peoples and failed to develop, so they also lack a name for this more manly brother of pity.
He that is angry without cause, shall be in danger; but he that is angry with cause, shall not be in danger: for without anger, teaching will be useless, judgments unstable, crimes unchecked. ... To be angry is therefore not always an evil.
If, in proportion as our minds are enlarged, our hearts purified, and our consciences cultivated, our abhorrence of wrong and aversion to it increases, what must be the moral indignation of the infinite and holy God against wrong-doers?