Cicero

“To make a mistake is only human; to persist in a mistake is idiotic.”

“Quid? Quod eadem mente res dissimillimas comprehendimus, ut colorem saporem, calorem, odorem, sonum? Quae numquam quinque nuntiis animus cognosceret, nisi ad eum omnia referrentur et is omnium iudex solus esset.”

“The welfare of the people is the highest law”

“The countenance is the portrait of the soul, and the eyes mark its intention.”

“It is our own evil thoughts which madden us.”

“I prefer the most unfair peace to the most righteous war.”

“The mind becomes accustomed to things by the habitual sight of them, and neither wonders nor inquires about the reasons for things it sees all the time.”

“Memory is the treasury and guardian of all things.”— Cicero”

“Historia magistra vitae est”

“Nature herself has imprinted on the minds of all the idea of God”

“I would rather be wrong, by God, with Plato than be correct with those men.”

“Thus nature has no love for solitude, and always leans, as it were, on some support; and the sweetest support is found in the most intimate friendship.”

“Αν έχεις ένα κήπο και μια βιβλιοθήκη, έχεις όλα όσα σου χρειάζονται.”

“History is the witness that testifies to the passing of time; it illumines reality, vitalizes memory, provides guidance in daily life and brings us tidings of antiquities. 
”

“Two distinctive traits especially identify beyond a doubt a strong and dominant character. One trait is contempt for external circumstances, when one is convinced that men ought to respect, to desire, and to pursue only what is moral and right, that men should be subject to nothing, not to another man, not to some disturbing passion, not to Fortune. The second trait, when your character has the disposition I outlined just now, is to perform the kind of services that are significant and most beneficial; but they should also be services that are a severe challenge, that are filled with ordeals, and that endanger not only your life but also the many comforts that make life attractive.Of these two traits, all the glory, magnificence, and the advantage, too, let us not forget, are in the second, while the drive and the discipline that make men great are in the former.”

“atque illi artifices corporis simulacra ignotis nota faciebant; quae uel si nulla, nihilo sint tamen obscuriores clari uiri.”

“Life is nothing without friendship.”

“Vivere est Cogitare”

“When you wish to instruct, be brief; that men's [children's] minds take in quickly what you say, learn its lesson, and retain it faithfully. Every word that is unnecessary only pours over the side of a brimming mind.”

“What an ugly beast is the ape, and how like us.”

“The man who backbites an absent friend, nay, who does not stand up for him when another blames him, the man who angles for bursts of laughter and for the repute of a wit, who can invent what he never saw, who cannot keep a secret -- that man is black at heart: mark and avoid him.”

“My dear Scipio and Laelius. Men, of course, who have no resources in themselves for securing a good and happy life find every age burdensome. But those who look for all happiness from within can never think anything bad which Nature makes inevitable.”

“The best Armour of Old Age is a well spent life preceding it; a Life employed in the Pursuit of useful Knowledge, in honourable Actions and the Practice of Virtue; in which he who labours to improve himself from his Youth, will in Age reap the happiest Fruits of them; not only because these never leave a Man, not even in the extremest Old Age; but because a Conscience bearing Witness that our Life was well-spent, together with the Remembrance of past good Actions, yields an unspeakable Comfort to the Soul”

“Read at every wait; read at all hours; read within leisure; read in times of labor; read as one goes in; read as one goest out. The task of the educated mind is simply put: read to lead.”

“What is sweeter than lettered ease?”

“Wohl niemand tanzt, wenn er nüchtern ist, er müsste denn den Verstand verloren haben.”

“Where is there dignity unless there is honesty?”

“Omnia mea mecum porto.”

“nemo enim umquam est oratorem, quod Latine loqueretur, admiratus; si est aliter, inrident neque eum oratorem tantum modo, sed hominem non putant.”

“If you have a garden and a library, you have everything you need.”