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If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.

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René Descartes
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The Basics of Philosophy

Let yourself inspire by worldly wisdoms of famous philosophers from Aristoteles to Wittgenstein.
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The unexamined life is not worth living.
Socrates
73
Whereof one cannot speak, thereof one must be silent.
Ludwig Wittgenstein
57
Entities should not be multiplied unnecessarily.
William of Ockham
50
The life of man (in a state of nature) is solitary, poor, nasty, brutish, and short.
Thomas Hobbes
49
I think therefore I am.
René Descartes
57
He who thinks great thoughts, often makes great errors.
Martin Heidegger
59
We live in the best of all possible worlds.
Gottfried Wilhelm Leibniz
48
What is rational is actual and what is actual is rational.
G. W. F. Hegel
40
God is dead! He remains dead! And we have killed him.
Friedrich Nietzsche
40
There is but one truly serious philosophical problem, and that is suicide.
Albert Camus
33
One cannot step twice in the same river.
Heraclitus
41
The greatest happiness of the greatest number is the foundation of morals and legislation.
Jeremy Bentham
38
To be is to be perceived.
Bishop George Berkeley
41
Happiness is not an ideal of reason but of imagination.
Immanuel Kant
47
No man's knowledge here can go beyond his experience.
John Locke
40
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
32
Liberty consists in doing what one desires.
John Stuart Mill
36
It is undesirable to believe a proposition when there is no ground whatever for supposing it true.
Bertrand Russell
31
Even while they teach, men learn.
Seneca the Younger
40
There is only one good, knowledge, and one evil, ignorance.
Socrates
40
If God did not exist, it would be necessary to invent Him.
Voltaire
36
This is patently absurd; but whoever wishes to become a philosopher must learn not to be frightened by absurdities.
Bertrand Russell
31
One cannot conceive anything so strange and so implausible that it has not already been said by one philosopher or another.
René Descartes
29
Leisure is the mother of philosophy.
Thomas Hobbes
30
Philosophy is a battle against the bewitchment of our intelligence by means of language.
Ludwig Wittgenstein
33
There is only one thing a philosopher can be relied upon to do, and that is to contradict other philosophers.
William James
32
We are what we repeatedly do. Excellence, then, is not an act, but a habit.
Aristotle
45
Only one man ever understood me, and he didn’t understand me.
G. W. F. Hegel
27
The mind is furnished with ideas by experience alone.
John Locke
33
Life must be understood backward. But it must be lived forward.
Søren Kierkegaard
37
Science is what you know. Philosophy is what you don't know.
Bertrand Russell
36
Metaphysics is a dark ocean without shores or lighthouse, strewn with many a philosophic wreck.
Immanuel Kant
25
Philosophy is at once the most sublime and the most trivial of human pursuits.
William James
21
History is Philosophy teaching by examples.
Thucydides
25
He who is unable to live in society, or who has no need because he is sufficient for himself, must be either a beast or a god.
Aristotle
30
You can discover more about a person in an hour of play than in a year of conversation.
Plato
36
Things alter for the worse spontaneously, if they be not altered for the better designedly.
Francis Bacon
29
All that is necessary for the triumph of evil is that good men do nothing.
Edmund Burke
37
Is man merely a mistake of God's? Or God merely a mistake of man's?
Friedrich Nietzsche
30
I would never die for my beliefs because I might be wrong.
Bertrand Russell
27
Religion is the sign of the oppressed ... it is the opium of the people.
Karl Marx
27
Happiness is the highest good.
Aristotle
30
If men were born free, they would, so long as they remained free, form no conception of good and evil.
Baruch Spinoza
27
The greater the difficulty, the more glory in surmounting it.
Epicurus
34
Whatever is reasonable is true, and whatever is true is reasonable.
G. W. F. Hegel
30
Morality is not the doctrine of how we may make ourselves happy, but of how we may make ourselves worthy of happiness.
Immanuel Kant
32
Man is condemned to be free.
Jean-Paul Sartre
27
It is one thing to show a man that he is in error, and another to put him in possession of truth.
John Locke
31