Descartes is rightly regarded as the father of modern philosophy primarily and generally because he helped the faculty of reason to stand on its own feet by teaching men to use their brains
in place whereof the Bible, on the one hand, and Aristotle, on the other, had previously served.
To repeat abstractly, universally, and distinctly in concepts the whole inner nature of the world , and thus to deposit it as a reflected image in permanent concepts always ready for the faculty of reason , this and nothing else is philosophy.
Many undoubtedly owe their good fortune to the circumstance that they possess a pleasing smile with which they win hearts. Yet these hearts would do better to beware and to learn from Hamlet's tables that one may smile, and smile, and be a villain.
The intellectual attainments of a man who thinks for himself resemble a fine painting, where the light and shade are correct, the tone sustained, the colour perfectly hamonized; it is true to life.
Every man takes the limits of his own field of vision for the limits of the world. This is an error of the intellect as inevitable as that error of the eye which lets you fancy that on the horizon heaven and earth meet.
Truth is no harlot who throws her arms round the neck of him who does not desire her; on the contrary, she is so coy a beauty that even the man who sacrifices everything to her can still not be certain of her favors.
Men best show their character in trifles, where they are not on their guard. It is in the simplest habits, that we often see the boundless egotism which pays no regard to the feelings of others and denies nothing to itself.
For an author to write as he speaks is just as reprehensible as the opposite fault, to speak as he writes; for this gives a pedantic effect to what he says, and at the same time makes him hardly intelligible.