If studying history mainly makes you feel happy and proud, you probably aren’t really studying history.

Quoted without attribution by Fara Dabhoiwala in the New York Review (July 1, 2021)

So many mutations of states and kingdoms, and so many turns and revolutions of public fortune, will make us wise enough to make no great wonder of our own.

Michel de Montaigne

   

It was impossible for any one to open his grief to a neighbor and to concert measures to defend himself, as he would have had to speak either to one whom he did not know, or whom he knew but did not trust.

Thucydides, The History of the Peloponnesian War

Athenians: Aim at what is feasible, holding in view the real sentiments of us both; since you know as well as we do that right, as the world goes, is only in question between equals in power, while the strong do what they can and the weak suffer what they must....

Melians: As we think, at any rate, it is expedient —we speak as we are obliged, since you enjoin us to let right alone and talk only of interest— that you should not destroy what is our common protection, the privilege of being allowed in danger to invoke what is fair and right, and even to profit by arguments not strictly valid if they can be got to pass current....

Athenians:  Of the gods we believe, and of men we know, that by a necessary law of their nature they rule wherever they can.....  It is certain that those who do not yield to their equals, who keep terms with their superiors, and are moderate towards their inferiors, on the whole succeed best.

  Thucydides (Book Five), The History of the Peloponnesian War

Your country has a right to your services in sustaining the glories of her position. These are a common source of pride to you all, and you cannot decline the burdens of empire and still expect to share its honors. You should remember also that what you are fighting against is not merely slavery as an exchange for independence, but also loss of empire and danger from the animosities incurred in its exercise. Besides, to recede is no longer possible.... For what you hold is, to speak somewhat plainly, a tyranny; to take it perhaps was wrong, but to let it go is unsafe.

Pericles, as quoted by Thucydides in  The History of the Peloponnesian War