The organizing principle for this quote collection is to keep it short and easy. You will find insights, proverbs, memes and jokes from different cultures and time periods. Famous quotes are matched with thought-provoking questions, and the overall focus is, as always, on philosophy. 

Here are some samples from different fields: 

When leaves stop falling, fall starts leaving. ~ Japanese Proverb

In biology, cells multiply by dividing. ~ Anonymous

‘Two things awe me most, the starry sky above me and the moral law within me.’ Immanuel Kant

“Whereof one cannot speak, thereof one must be silent” – Ludwig Wittgenstein

“History is Philosophy teaching by examples”  -Thucydides

“I think therefore I am” (“Cogito, ergo sum”) – René Descartes

“He who thinks great thoughts, often makes great errors” – Martin Heidegger

“We live in the best of all possible worlds” – Leibniz

“What is rational is actual and what is actual is rational” – G. W. F. Hegel

“God is dead! He remains dead! And we have killed him.” – Friedrich Nietzsche

“The life of man (in a state of nature) is solitary, poor, nasty, brutish, and short” – Thomas Hobbes

“There is but one truly serious philosophical problem, and that is suicide” – Albert Camus

“The unexamined life is not worth living” – Socrates

“One cannot step twice in the same river” – Heraclitus

In the same river, we both step and do not step, we are and we are not. Heraclitus (Fragment 49a)

What we saw and grasped, that we leave behind; but what we did not see and did not grasp, that we bring. Heraclitus (Fragment 56)

“The greatest happiness of the greatest number is the foundation of morals and legislation” – Jeremy Bentham

“To be is to be perceived” (“Esse est percipi”)– Bishop George Berkeley

“Happiness is not an ideal of reason but of imagination” – Immanuel Kant

"I've always wondered why meteorites land in craters."   - Sabine Hossenfelder

“No man's knowledge here can go beyond his experience” – John Locke

“God is not willing to do everything, and thus take away our free will and that share of glory which belongs to us” – Niccolo Machiavelli

“Liberty consists in doing what one desires” – John Stuart Mill

“It is undesirable to believe a proposition when there is no ground whatever for supposing it true” – Bertrand Russell

“The living are only a species of the dead, and a rare species at that.” Nietzsche

‘The more successful the villain, the more successful the picture.’ Alfred Hitchcock

Two wrongs do not make a right, but three lefts do.

Nursery teacher : `When ice melts, what do you get ?'  One boy answered : `Spring.'

“We are what we repeatedly do. Excellence, then, is not an act, but a habit” – Aristotle