Seneca the Younger: Doing

“I do not trust my eyes to tell me what a man is: I have a better and more trustworthy light by which I can distinguish what is true from what is false: let the mind find out what is good for the mind.”
Oculis de homine non credo, habeo melius et certius lumen quo a falsis uera diiudicem: animi bonum animus inueniat.

“The old Romans had a custom which survived even into my lifetime. They would add to the opening words of a letter: "If you are well, it is well; I also am well." Persons like ourselves would do well to say. "If you are studying philosophy, it is well." For this is just what "being well" means. Without philosophy the mind is sickly.”
Mos antiquis fuit, usque ad meam servatus aetatem, primis epistulae verbis adicere 'si vales bene est, ego valeo'. Recte nos dicimus 'si philosopharis, bene est'. Valere enim hoc demum est. Sine hoc aeger est animus.

“Pyrrhus: No law demands mercy to prisoners
Agamemnon: Though the law forbids it not, yet decency forbids it.
Pyr: The victor is at liberty to do whatever he likes.
Agam.: To whom much is allowed, it is least suitable to act wantonly.”
Pyrrhus: Lex nulla capto parcit aut poenam impedit. Agamemnon: Quod non vetat lex, hoc vetat fieri pudor. Pyr: Quodcumque libuit facere victori licet. Agam.: Minimum decet libere cui multum licet.

“You are doing an excellent thing, one which will be wholesome for you, if, as you write me, you are persisting in your effort to attain sound understanding; it is foolish to pray for this when you can acquire it from yourself. We do not need to uplift our hands towards heaven, or to beg the keeper of a temple to let us approach his idol's ear, as if in this way our prayers were more likely to be heard. A god is near you, with you, and in you. This is what I mean, Lucilius: there sits a holy spirit within us, one who marks our good and bad deeds, and is our a guardian.”
Facis rem optimam et tibi salutarem, si, ut scribis, perseveras ire ad bonam mentem, quam stultum est optare, cum possis a te impetrare. Non sunt ad caelum elevandae inarms nee exorandus aedituus, ut nos ad aurem simulacri, quasi magis exaudiri possimus, admittat; Prope est a te deus, tecum est, intus est. Ita dico, Lucili: sacer intra nos spiritus sedet, malorum bonorumque nostrorum observator et custos...

“Should I be surprised that dangers which have always surrounded me should at last attack me? A great part of mankind, when about to sail, do not think of a storm. I shall never be ashamed of a reporter of bad news in a good cause.”

“Do you seek Alcides' equal? None is, except himself.”

“"Although," said he [Cato], "all the world has fallen under one man's sway, although Caesar's legions guard the land, his fleets the sea, and Caesar's troops beset the city gates, yet Cato has a way of escape; with one single hand he will open a wide path to freedom. This sword, unstained and blameless even in civil war, shall at last do good and noble service: the freedom which it could not give to his country it shall give to Cato!”
"Licet," inquit, "omnia in unius dicionem concesserint, custodiantur legionibus terrae, classibus maria, Caesarianus portas miles obsideat; Cato qua exeat habet; una manu latam libertati viam faciet. Ferrum istud, etiam civili bello purum et innoxium, bonas tandem ac nobiles edet operas: libertatem, quam patriae non potuit, Catoni dabit.

“Men do not care how nobly they live, but only how long, although it is within the reach of every man to live nobly, but within no man's power to live long.”
Nemo quam bene vivat sed quam diu curat, cum omnibus possit contingere ut bene vivant, ut diu nulli.

“Why then do you occupy me with the words rather than with the works of wisdom? Make me braver, make me calmer, make me the equal of Fortune, make me her superior.”

“Tell me what to avoid, what to seek, by what studies to strengthen my tottering mind, how I may rebuff the waves that strike me abeam and drive me from my course, by what means I may be able to cope with all my evils, and by what means I can be rid of the calamities that have plunged in upon me and those into which I myself have plunged. Teach me how to bear the burden of sorrow without a groan on my part, and how to bear prosperity without making others groan; also, how to avoid waiting for the ultimate and inevitable end, and to beat a retreat of my own free will, when it seems proper to me to do so.”

“They have been spoken by Plato, spoken by Zeno, spoken by Chrysippus or by Posidonius, and by a whole host of Stoics as numerous as excellent. I shall show you how men can prove their words to be their own: it is by doing what they have been talking about.”

“And we cannot change this order of things; but what we can do is to acquire stout hearts, worthy of good men, thereby courageously enduring chance and placing ourselves in harmony with Nature.”

“Do you desire another case? Take that of the younger Marcus Cato, with whom Fortune dealt in a more hostile and more persistent fashion. But he withstood her, on all occasions, and in his last moments, at the point of death, showed that a brave man can live in spite of Fortune, can die in spite of her. His whole life was passed either in civil warfare, or under a political regime which was soon to breed civil war.”

“Meanwhile, hold fast to this thought, and grip it close: yield not to adversity; trust not to prosperity; keep before your eyes the full scope of Fortune’s power, as if she would surely do whatever is in her power to do.”

“What else is there which you would regret to have taken from you? Friends? But who can be a friend to you? Country? What? Do you think enough of your country to be late to dinner? The light of the sun? You would extinguish it, if you could; for what have you ever done that was fit to be seen in the light?”

“Do you ask me whom I have conquered? Neither the Persians, nor the far-off Medes, nor any warlike race that lies beyond the Dahae; not these, but greed, ambition, and the fear of death that has conquered the conquerors of the world.”

“I should prefer to be free from torture; but if the time comes when it must be endured, I shall desire that I may conduct myself therein with bravery, honour, and courage. Of course I prefer that war should not occur; but if war does occur, I shall desire that I may nobly endure the wounds, the starvation, and all that the exigency of war brings. Nor am I so mad as to crave illness; but if I must suffer illness, I shall desire that I may do nothing which shows lack of restraint, and nothing that is unmanly. The conclusion is, not that hardships are desirable, but that virtue is desirable, which enables us patiently to endure hardships.”

“You must lay aside the burdens of the mind; until you do this, no place will satisfy you.”

“You do not know where death awaits you; so be ready for it everywhere.”