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One might think this means that imaginary numbers are just a mathematical game having nothing to do with the real world. From the viewpoint of positivist philosophy, however, one cannot determine what is real. All one can do is find which mathematical models describe the universe we live in. It turns out that a mathematical model involving imaginary time predicts not only effects we have already observed but also effects we have not been able to measure yet nevertheless believe in for other reasons. So what is real and what is imaginary? Is the distinction just in our minds?
Stephen Hawking
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The Interpretation of the Laws of Nature in a Common-wealth, dependeth not on the books of Moral Philosophy. The Authority of writers, without the Authority of the Commonwealth, maketh not their opinions Law, be they never so true.
Thomas Hobbes
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The test of a religion or philosophy is the number of things it can explain.
Ralph Waldo Emerson
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Philosophy stands in need of a science which shall determine the possibility, principles, and extent of human knowledge à priori.
Immanuel Kant
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Superstition sets the whole world in flames; philosophy quenches them.
Voltaire
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It is my hope that as the Negro plunges deeper into the quest for freedom and justice he will plunge even deeper into the philosophy of non-violence.
Martin Luther King, Jr.
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Science and philosophy can not be kept in water-tight compartments.
William Ralph Inge
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All definite knowledge - so I should contend - belongs to science; all dogma as to what surpasses definite knowledge belongs to theology. But between theology and science there is a No Man's Land, exposed to attack by both sides; this No Man's Land is philosophy.
Bertrand Russell
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philosophy must obey its own rules and be based upon its own principles; truth, however, can only be one.
Pope John Paul II
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Our intonations contain our philosophy of life, what each of us is constantly telling himself about things.
Marcel Proust
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Philosophy teaches us to bear with calmness — the misfortunes of our friends.
Jean-Jacques Rousseau
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What would we not give for some great poem to read now, which would be in harmony with the scenery,--for if men read aright, methinks they would never read anything but poems. No history nor philosophy can supply their place.
Henry David Thoreau
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Wonder is the foundation of all philosophy, inquiry the progress, ignorance the end.
Michel de Montaigne
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In our science and philosophy, even, there is commonly no true and absolute account of things. The spirit of sect and bigotry has planted its hoof amid the stars. You have only to discuss the problem, whether the stars are inhabited or not, in order to discover it.
Henry David Thoreau
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But the soul which has been polluted, and is impure at the time of her departure, and is the companion and servant of the body always, and is in love with and fascinated by the body and by the desires and pleasures of the body, until she is led to believe that the truth exists only in bodily form, which a man may touch and see and taste and use for the purposes of his lusts—the soul, I mean, accustomed to hate and fear and avoid the intellectual principle, which to the bodily eye is dark and invisible, and can be attained only by philosophy—do you suppose that such a soul as this will depart pure and unalloyed?
Socrates
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Facts fled before philosophy like frightened forest things.
Oscar Wilde
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Gradually it has become clear to me what every great philosophy so far has been: namely, the personal confession of its author and a kind of involuntary and unconscious memoir.
Friedrich Nietzsche
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I will not call it my philosophy; for I did not make it. God and humanity made it; and it made me.
G. K. Chesterton
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It is love, and not German philosophy, that is the true explanation of the world, whatever may be the explanation of the next.
Oscar Wilde
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The purpose of a work of fiction is to appeal to the lingering after-effects in the reader's mind as differing from, say, the purpose of oratory or philosophy which respectively leave people in a fighting or thoughtful mood.
F. Scott Fitzgerald
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To create a healthy philosophy you should renounce metaphysics but be a good mathematician.
Bertrand Russell
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Experience has shown, and a true philosophy will always show, that a vast, perhaps the larger portion of the truth arises from the seemingly irrelevant.
Edgar Allan Poe
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... he who is a philosopher or lover of learning, and is entirely pure at departing, is alone permitted to reach the gods. And this is the reason, Simmias and Cebes, why the true votaries of philosophy abstain from all fleshly lusts, and endure and refuse to give themselves up to them—not because they fear poverty or ruin of their families, like the lovers of money, and the world in general; nor like the lovers of power and honor, because they dread the dishonor or disgrace of evil deeds.
Socrates
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We have heard much about the poetry of mathematics, but very little of it has as yet been sung. The ancients had a juster notion of their poetic value than we. The most distinct and beautiful statements of any truth must take at last the mathematical form. We might so simplify the rules of moral philosophy, as well as of arithmetic, that one formula would express them both.
Henry David Thoreau
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We are living in the era of premeditation and the perfect crime. Our criminals are no longer helpless children who could plead love as their excuse. On the contrary, they are adults and the have the perfect alibi: philosophy, which can be used for any purpose - even for transforming murderers into judges.
Albert Camus
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