Philosophy: unintelligible answers to insoluble problems.
Adams, Henry Brooks

It is true, that a little Philosophy inclineth Man’s Minde to Atheism; but depth in Philosophy bringeth Men’s Mindes about to Religion.
Bacon, Sir Francis

The philosophy of one century is the common sense of the next.
Beecher, Henry Ward

Nothing is like it seems, but everything is exactly like it is
Berra, Yogi

What is philosophy but a continual battle against custom?
Carlyle, Thomas

Philosophy, rightly defined, is simply the love of wisdom.
Cicero, Marcus Tullius

cogito ergo sum (I think; therefore I am)
Descartes, Rene

Here is the beginning of philosophy: a recognition of the conflicts between men, a search for their cause, a condemnation of mere opinion, and the discovery of a standard of judgment.
Epictetus

There is nothing so absurd or ridiculous that has not at some time been said by some philosopher.
Goldsmith, Oliver

We live in a world in which politics has replaced philosophy.
Gross, Martin L

Any philosophy that can be put in a nutshell belongs there.
Harris, Sidney J

What we see is not reality in itself, but reality exposed to our method of questioning.
Heisenberg, Werner

No man ever steps in the same river twice, for it's not the same river and he's not the same man.
Heraclitus

Everything flows and nothing stays.
Heraclitus

There is no reality except the one contained within us.
Hesse, Hermann

Any two philosophers can tell each other all they know in two hours.
Holmes, Jr, Oliver Wendell

If we take in our hand any volume; of divinity or school metaphysics, for instance; let us ask, Does it contain any abstract reasoning concerning quantity or number? No. Does it contain any experimental reasoning concerning matter of fact and existence? No. Commit it then to the flames: for it can contain nothing but sophistry and illusion.
Hume, David

There is only one thing a philosopher can be relied upon to do, and that is to contradict other philosophers.
James, William

What could begin to deny self, if there were not something in man different from self?
Law, William

(Nil posse creari de nilo) Nothing can be created out of nothing.
Lucretius

Philosophy consists very largely of one philosopher arguing that all others are jackasses. He usually proves it, and I should add that he also usually proves that he is one himself.
Mencken, Henry Louis

All philosophies are mental fabrications. There has never been a single doctrine by which one could enter the true essence of things.
Nagarjuna

Can an ass be tragic? To perish under a burden one can neither bear nor throw off? The case of the philosopher
Nietzsche, Friedrich Wilhelm

Wonder is the feeling of a philosopher; and philosophy begins in wonder
Plato

The men who are not interested in philosophy need it most urgently; they are most helplessly in its power.
Rand, Ayn