“The highest perfection of human life consists in the mind of man being detached from care, for the sake of God.”

Australian of the Year Government Site http://www.australianoftheyear.gov.au/pages/page75.asp

Vol. I : Preface (1772)
Institutes of Natural and Revealed Religion (1772–1774)
Context: The mind of man will never be able to contemplate the being, perfections, and providence of God without meeting with inexplicable difficulties. We may find sufficient reason for acquiescing in the darkness which involves these great subjects, but we must never expect to see them set in a perfectly clear light. But notwithstanding this, we may know enough of the divine being, and of his moral government, to make us much better and happier beings than we could be without such knowledge; and even the consideration of the insuperable difficulties referred to above is not without its use, as it tends to impress the mind with sentiments of reverence, humility, and submission.

Source: Christianizing the Social Order (1912), p. 104

Source: Counterrevolution and Revolt (1972), Chapter "Nature and Revolution," in The Essential Marcuse: Selected Writings of Philosopher and Social Critic Herbert Marcuse, edited by Andrew Feenberg and ‎William Leiss, Beacon Press, 2007, pp. 240 https://books.google.it/books?id=JqoyBgAAQBAJ&pg=PA240-241

Variant translation: Now slavery has a certain likeness to death, hence it is also called civil death. For life is most evident in a thing's moving itself, while what can only be moved by another, seems to be as if dead. But it is manifest that a slave is not moved by himself, but only at his master's command.
Chapter 14 https://www.pathsoflove.com/aquinas/perfection-of-the-spiritual-life.html#chapter14
On The Perfection of the Spiritual Life https://www.pathsoflove.com/aquinas/perfection-of-the-spiritual-life.html (1269-1270)
Original: (la) Vita enim in hoc maxime manifestatur quod aliquid movet se ipsum; quod autem non potest moveri nisi ab alio, quasi mortuum esse videtur.

The Banquet of the Seven Wise Men, 11
Bartlett's Familiar Quotations, 10th ed. (1919)

Founding Address (1876), Some Characteristics of the American Ethical Movement (1925)
Context: Spiritual evolution is the progressive advance of mankind toward a state of things in which the light of ethical perfection shall be reflected from the face of human society; that is, in which all men shall live and move and have their being in mutually promoting the highest life of each and all. It means that the object of social reformation shall not be a mere change in the conditions under which men live, but a change in human nature itself. It means that we shall look forward consciously to the breaking forth of new powers in ourselves, to the release, through our own efforts, of capacities dimly latent in us.

Source: The Sayings and Teachings of the Great Mystics of Islam (2004), p. 83

Summa Theologica (1265–1274), Unplaced by chapter