“The two maxims of any great man at court are always to keep his countenance and never to keep his word.”
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Thoughts on Various Subjects from Miscellanies (1711-1726)
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Jonathan Swift 141
Anglo-Irish satirist, essayist, and poet 1667–1745Related quotes

The Rickover Effect (1992)
Context: As a guide to engineering ethics, I should like to commend to you a liberal adaptation of the injunction contained in the oath of Hippocrates that the professional man do nothing that will harm his client. Since engineering is a profession which affects the material basis of everyone’s life, there is almost always an unconsulted third party involved in any contact between the engineer and those who employ him — and that is the country, the people as a whole. These, too, are the engineer’s clients, albeit involuntarily. Engineering ethics ought therefore to safeguard their interests most carefully. Knowing more about the public effects his work will have, the engineer ought to consider himself an “officer of the court” and keep the general interest always in mind.
Dreamthorp: Essays written in the Country (1863).

Great Books: The Foundation of a Liberal Education (1954)

“A wise man will keep his Suspicions muzzled, but he will keep them awake.”
Political, Moral, and Miscellaneous Reflections (1750), Miscellaneous Thoughts and Reflections

"An Exposition of the Mission of England: Addressed to the Peoples of Europe" in The Reasoner, Vol. 3, No. 54 (1847), p. 321
Context: It is not, happily, within our power thus to work destruction in the universal womb of things; still within the sphere of human influence — which extends to the uttermost limit of our world's circumambient atmosphere — we can, and do, modify all nature's kingdom; bending towards good or ill, health or disease, harmony or discord, each part, each unit of the universal plan. Upon our just or erroneous comprehension then, of the laws of nature, must depend our adaptation of art for the right improvement or for the ignorant deterioration of Nature's works. And moreover, upon our just or erroneous interpretation of these in the first division of truth — the physical — will depend our interpretation of them in the intellectual and in the moral; from all which it follows, that our system of human economy will present, even as it has ever presented, a practical exhibition of that of the universe. There is more consistency in the human mind, as in the course of events, than is supposed. In both, the first link in the chain decides the last. Man hath ever made a cosmogony in keeping with his views in physics; a scheme of government in keeping with his cosmogony; a theory of ethics in keeping with his government, and a code of law and theology in keeping with his ethics. Every perception of the human mind modifies human practice. Science is but the theory of art.

Numbers 6:24-26.
Tyndale's translations

“Care keeps his watch in every old man’s eye,
And where care lodges, sleep will never lie.”
Source: Romeo and Juliet