"Six mistakes mankind keeps making century after century: Believing that personal gain is made by crushing others; Worrying about things that cannot be changed or corrected; Insisting that a thing is impossible because we cannot accomplish it; Refusing to set aside trivial preferences; Neglecting development and refinement of the mind; Attempting to compel others to believe and live as we do." —Cicero

"There is no easy way from the earth to the stars." —Seneca

"Better to do a little well than a great deal badly." —Socrates

"We are more often frightened than hurt; and we suffer more in imagination than in reality." —Seneca

"We have two ears and one mouth, so we should listen more than we say." —Zeno, Quoted By Diogenes Laërtius

"The only thing I know is that I know nothing." —Socrates

"Mortal as I am, I know that I am born for a day. But when I follow at my pleasure the serried multitude of the stars in their circular course, my feet no longer touch the earth." —Ptolemy

"We are more often frightened than hurt; and we suffer more in imagination than in reality." —Seneca

"It is greed to do all the talking but to not want to listen at all." —Democritus

"It is essential that we not respond impulsively… take a moment before reacting, and you will find it easier to maintain control." —Epictetus

"External things are not the problem. It’s your assessment of them, which you can erase right now." —Marcus Aurelius

"He suffers more than necessary, who suffers before it is necessary." —Marcus Aurelius

"Quality is not an act, it is a habit." —Aristotle

"Nothing, to my way of thinking, is a better proof of a well ordered mind than a man’s ability to stop just where he is and pass some time in his own company." —Seneca

"Not what we have but what we enjoy constitutes our abundance." —Epicurus

"Human behavior flows from three main sources: desire, emotion, and knowledge." —Plato

"In marriage, there must be complete companionship and concern for each other on the part of both husband and wife, in health and in sickness and at all times, because they entered upon the marriage for this reason as well as to produce offspring. When such caring for one another is perfect, and the married couple provides it for one another, and each strives to outdo the other, then this is marriage as it ought to be and deserving of emulation, since it is a noble union. But when one partner looks to his own interests alone and neglects the other’s, or (by Zeus) the other is so minded that he lives in the same house, but keeps his mind on what is outside it, and does not wish to pull together with his partner or to cooperate, then inevitably the union is destroyed, and although they live together their common interests fare badly, and either they finally get divorced from one another or they continue on in an existence that is worse than loneliness." —Rufus

"He needs little who desires but little." —Cleanthes

"For a man to conquer himself is the first and noblest of all victories." —Plato

"Wealth is able to buy the pleasures of eating, drinking and other sensual pursuits—yet can never afford a cheerful spirit or freedom from sorrow." —Musonius Rufus, Musonius Rufus On How To Live