Various people, many modern quotes
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“To be ignorant of what happened before you were born is to remain a child forever.” said Cicero.

We must learn from history, or we will repeat its mistakes. “If we do not know our own history, we will simply have to endure all the same mistakes, sacrifices and absurdities all over again.” declared Aleksandr Solzhenitsyn.

“Those who cannot remember the past are condemned to repeat it.” George Santayana.

As Professor C.S. Lewis declared “It is not the remembered, but the forgotten, past that enslaves us.”

Sir Francis Bacon declared: “Scientia potentia est” Knowledge is power.

“The qualities of character can be arranged in triads, in each of which the first and last qualities will be extremes and vices, and the middle quality a virtue or an excellence. So between cowardice and rashness is courage; between stinginess and extravagance is liberality; between sloth and greed is ambition; between humility and pride is modesty; between secrecy and loquacity, honesty; between moroseness and buffoonery, good humor; between quarrelsomeness and flattery, friendship; between Hamlet’s indecisiveness and Quixote’s impulsiveness is self-control. “Right,” then, in ethics or conduct, is not different from “right” in mathematics or engineering; it means correct, fit, what works best to the best result.”
― Will Durant, The Story of Philosophy

Pity is aroused by unmerited misfortune, fear by the misfortune of a man like ourselves. Aristotle

“There is no knowledge that is not power.” ― Ralph Waldo Emerson

“The only true wisdom is in knowing you know nothing.”― Socrates

“No thief, however skillful, can rob one of knowledge, and that is why knowledge is the best and safest treasure to acquire.” ― L. Frank Baum, The Lost Princess of Oz

“The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.”
― Daniel J. Boorstin

“Wisdom cannot be imparted. Wisdom that a wise man attempts to impart always sounds like foolishness to someone else … Knowledge can be communicated, but not wisdom. One can find it, live it, do wonders through it, but one cannot communicate and teach it.”
― Hermann Hesse, Siddhartha

“Any fool can know. The point is to understand.” ― Albert Einstein

“I did then what I knew how to do. Now that I know better, I do better.” ― Maya Angelou

“Great minds are always feared by lesser minds.” ― Dan Brown, The Lost Symbol

“Confidence is ignorance. If you’re feeling cocky, it’s because there’s something you don’t know.”
― Eoin Colfer, Artemis Fowl

“Your assumptions are your windows on the world. Scrub them off every once in a while, or the light won’t come in.” ― Isaac Asimov

“It is the absence of facts that frightens people: the gap you open, into which they pour their fears, fantasies, desires.” ― Hilary Mantel, Wolf Hall

“All knowledge hurts.” ― Cassandra Clare, City of Bones

“For me, it is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring.”
― Carl Sagan, The Demon-Haunted World: Science as a Candle in the Dark

“I mean, you could claim that anything’s real if the only basis for believing in it is that nobody’s proved it doesn’t exist!” ― J.K. Rowling

“Knowledge is power. Power to do evil…or power to do good. Power itself is not evil. So knowledge itself is not evil.”
― Veronica Roth, Allegiant

Theodore Roosevelt
“People don’t care how much you know until they know how much you care”
― Theodore Roosevelt

“The eye sees only what the mind is prepared to comprehend.”
― Robertson Davies, Tempest-Tost

“I am an atheist, out and out. It took me a long time to say it. I’ve been an atheist for years and years, but somehow I felt it was intellectually unrespectable to say one was an atheist, because it assumed knowledge that one didn’t have. Somehow, it was better to say one was a humanist or an agnostic. I finally decided that I’m a creature of emotion as well as of reason. Emotionally, I am an atheist. I don’t have the evidence to prove that God doesn’t exist, but I so strongly suspect he doesn’t that I don’t want to waste my time.”
― Isaac Asimov

“An investment in knowledge always pays the best interest.”
― Benjamin Franklin, The Way to Wealth: Ben Franklin on Money and Success

“I do not pretend to be able to prove that there is no God. I equally cannot prove that Satan is a fiction. The Christian god may exist; so may the gods of Olympus, or of ancient Egypt, or of Babylon. But no one of these hypotheses is more probable than any other: they lie outside the region of even probable knowledge, and therefore there is no reason to consider any of them.”
― Bertrand Russell , Why I Am Not a Christian and Other Essays on Religion and Related Subjects

“Few people are capable of expressing with equanimity opinions which differ from the prejudices of their social enviroment. Most people are incapable of forming such opinions.” (Essay to Leo Baeck, 1953)” ― Albert Einstein

“Ignorance more frequently begets confidence than does knowledge: it is those who know little, not those who know much, who so positively assert that this or that problem will never be solved by science.”
― Charles Darwin, The Descent of Man

“Knowledge comes, but wisdom lingers.”
― Alfred Lord Tennyson

“It was better to know the worst than to wonder.”
― Margaret Mitchell, Gone with the Wind

“To learn which questions are unanswerable, and not to answer them: this skill is most needful in times of stress and darkness.”
― Ursula K. Le Guin, The Left Hand of Darkness

“A little Learning is a dangerous Thing.” ― Alexander Pope

“Whatever in creation exists without my knowledge exists without my consent.”
― Cormac McCarthy, Blood Meridian, or the Evening Redness in the West

“The hardest thing of all is to find a black cat in a dark room, especially if there is no cat.”
― Confucius

“Unless you try to do something beyond what you have already mastered, you will never grow.”
― Ronald E. Osborn

“Knowing is not enough; we must apply. Willing is not enough; we must do.”
― Johann wolfgang von Goethe

“You can’t know, you can only believe – or not.”
― C.S. Lewis

Gautama Buddha
“Conquer the angry one by not getting angry; conquer the wicked by goodness; conquer the stingy by generosity, and the liar by speaking the truth.
[Verse 223]”
― Siddhārtha Gautama, The Dhammapada

“Science tells us how to heal and how to kill; it reduces the death rate in retail and then kills us wholesale in war; but only wisdom—desire coordinated in the light of all experience—can tell us when to heal and when to kill.”
― Will Durant, The Story of Philosophy

“Excellence is an art won by training and habituation: we do not act rightly because we have virtue or excellence, but we rather have these because we have acted rightly; “these virtues are formed in man by his doing the actions”;[69] we are what we repeatedly do. Excellence, then, is not an act but a habit;”
― Will Durant, The Story of Philosophy

“Philosophy begins when one learns to doubt—particularly to doubt one’s cherished beliefs, one’s dogmas and one’s axioms.”
― Will Durant, The Story of Philosophy

“There is no real philosophy until the mind turns round and examines itself.”
― Will Durant, The Story of Philosophy

“Every form of government tends to perish by excess of its basic principle. Aristocracy ruins itself by limiting too narrowly the circle withing which power is confined; oligarchy ruins itself by the incautious for immediate wealth… But even democracy ruins itself by excess-of democracy. Its basic principle is the equal right of all to hold office and determine public policy. This is at first glance a delightful arrangement; it becomes disastrous because the people are not properly equipped by education to select the best rulers and the wisest courses… The upshot of such a democracy is tyranny or autocracy; the crowd so love flattery, it is so “hungry for honey,” that at last the wiliest and most unscrupulous flatterer, calling himself the “protector of the people” rises to supreme power.”
― Will Durant, The Story of Philosophy: The Lives and Opinions of the World’s Greatest Philosophers

“Ultimately there are but three systems of ethics, three conceptions of the ideal character and the moral life.
One is that of Buddha and Jesus, which stresses the feminine virtues, considers all men to be equally precious, resists evil only by returning good, identifies virtue with love, and inclines in politics to unlimited democracy.
Another is the ethic of Machiavelli and Nietzsche, which stresses the masculine virtues, accepts the inequality of men, relishes the risks of combat and conquest and rule, identifies virtue with power, and exalts an hereditary aristocracy.
A third, the ethic of Socrates, Plato, and Aristotle, denies the universal applicability of either the feminine or the masculine virtues; considers that only the informed and mature mind can judge, according to diverse circumstance, when love should rule, and when power; identifies virtue, therefore, with intelligence; and advocates a varying mixture of aristocracy and democracy in government.”
― Will Durant, The Story of Philosophy: The Lives and Opinions of the World’s Greatest Philosophers