He who carries self-regard far enough to keep himself in good health and high spirits, in the first place thereby becomes an immediate source of happiness to those around, and in the second place maintains the ability to increase their happiness by altruistic actions. But one whose bodily vigour and mental health are undermined by self-sacrifice carried too far, in the first place becomes to those around a cause of depression, and in the second place renders himself incapable, or less capable, of actively furthering their welfare. In estimating conduct we must remember that there are those who by their joyousness beget joy in others, and that there are those who by their melancholy cast a gloom on every circle they enter.

Ethics (New York:1915), § 72, pp. 193-194 - The Principles of Ethics, Vol. I (1897) - Part I: The Data of Ethics