“Nature shows us only the tail of the lion. But there is no doubt in my mind that the lion belongs with it even if he cannot reveal himself to the eye all at once because of his huge dimension. We see him only the way a louse sitting upon him would.”

The Lover of God's Law Filled with Peace (January 1888) http://www.spurgeongems.org/vols34-36/chs2004.pdf

Source: The Old Man and the Sea

The Zebra
How to Tell Your Friends from the Apes (1931)

Ring for Jeeves (1953)

Pt II, p. 223 of the 1968 English edition
Philosophical Investigations (1953)

On aging, as quoted in "Did I say This? in The Observer (20 April 2008)
2008

Source: The Prince (1513), Ch. 18
Variant translations of portions of this passage:
Every one admits how praiseworthy it is in a prince to keep faith, and to live with integrity and not with craft. Nevertheless our experience has been that those princes who have done great things have held good faith of little account, and have known how to circumvent the intellect of men by craft, and in the end have overcome those who have relied on their word.
Ch. 18. Concerning the Way in which Princes should keep Faith (as translated by W. K. Marriott)
A prince being thus obliged to know well how to act as a beast must imitate the fox and the lion, for the lion cannot protect himself from traps, and the fox cannot defend himself from wolves. One must therefore be a fox to recognize traps, and a lion to frighten wolves.
You must know there are two ways of contesting, the one by the law, the other by force; the first method is proper to men, the second to beasts; but because the first is frequently not sufficient, it is necessary to have recourse to the second.
Context: A prince being thus obliged to know well how to act as a beast must imitate the fox and the lion, for the lion cannot protect himself from snares, and the fox cannot defend himself from wolves. One must therefore be a fox to recognise snares, and a lion to frighten wolves. Those that wish to be only lions do not understand this.
Context: How laudable it is for a prince to keep good faith and live with integrity, and not with astuteness, every one knows. Still the experience of our times shows those princes to have done great things who have had little regard for good faith, and have been able by astuteness to confuse men's brains, and who have ultimately overcome those who have made loyalty their foundation. You must know, then, that there are two methods of fighting, the one by law, the other by force: the first method is that of men, the second of beasts; but as the first method is often insufficient, one must have recourse to the second. It is therefore necessary to know well how to use both the beast and the man. This was covertly taught to princes by ancient writers, who relate how Achilles and many others of those princes were given to Chiron the centaur to be brought up, who kept them under his discipline; this system of having for teacher one who was half beast and half man is meant to indicate that a prince must know how to use both natures, and that the one without the other is not durable. A prince being thus obliged to know well how to act as a beast must imitate the fox and the lion, for the lion cannot protect himself from snares, and the fox cannot defend himself from wolves. One must therefore be a fox to recognise snares, and a lion to frighten wolves. Those that wish to be only lions do not understand this. Therefore, a prudent ruler ought not to keep faith when by so doing it would be against his interest, and when the reasons which made him bind himself no longer exist. If men were all good, this precept would not be a good one; but as they are bad, and would not observe their faith with you, so you are not bound to keep faith with them.... those that have been best able to imitate the fox have succeeded best. But it is necessary to be able to disguise this character well, and to be a great feigner and dissembler.

Letter to Nathaniel Hawthorne, including bits of a review of his work that he had written (c. 16 April 1851); published in Nathaniel Hawthorne and His WIfe Vol, I (1884) by Julian Hawthorne, Ch. VIII : Lenox, p. 388
Context: There is a certain tragic phase of humanity which, in our opinion, was never more powerfully embodied than by Hawthorne. We mean the tragedies of human thought in its own unbiassed, native, and profounder workings. We think that into no recorded mind has the intense feeling of the usable truth ever entered more deeply than into this man's. By usable truth, we mean the apprehension of the absolute condition of present things as they strike the eye of the man who fears them not, though they do their worst to him, — the man who, like Russia or the British Empire, declares himself a sovereign nature (in himself) amid the powers of heaven, hell, and earth. He may perish; but so long as he exists he insists upon treating with all Powers upon an equal basis. If any of those other Powers choose to withhold certain secrets, let them; that does not impair my sovereignty in myself; that does not make me tributary. And perhaps, after all, there is no secret. We incline to think that the Problem of the Universe is like the Freemason's mighty secret, so terrible to all children. It turns out, at last, to consist in a triangle, a mallet, and an apron, — nothing more! We incline to think that God cannot explain His own secrets, and that He would like a little information upon certain points Himself. We mortals astonish Him as much as He us. But it is this Being of the matter; there lies the knot with which we choke ourselves. As soon as you say Me, a God, a Nature, so soon you jump off from your stool and hang from the beam. Yes, that word is the hangman. Take God out of the dictionary, and you would have Him in the street.
There is the grand truth about Nathaniel Hawthorne. He says NO! in thunder; but the Devil himself cannot make him say yes. For all men who say yes, lie; and all men who say no,—why, they are in the happy condition of judicious, unincumbered travellers in Europe; they cross the frontiers into Eternity with nothing but a carpet-bag, — that is to say, the Ego. Whereas those yes-gentry, they travel with heaps of baggage, and, damn them! they will never get through the Custom House. What's the reason, Mr. Hawthorne, that in the last stages of metaphysics a fellow always falls to swearing so? I could rip an hour.

Solo quiero Leones en mi regimiento.
As quoted in San Martín, The Liberator (1971) by J. C. J. Metford, p. 33