„.. I am always between two currents of thought, first the material difficulties, turning round and round to make a living; and second, study of color. I am always in hope of making a discovery there, to express the love of two lovers by a marriage of two complementary colors, their mingling and their opposition, the mysterious vibrations of kindred tones. To express the thought of a brow by the radiance of a light tone against a sombre background. To express hope by some star, the eagerness of a soul by a sunset radiance. Certainly there is nothing in that of stereoscopic realism, but is it not some thing that actually exists?“

— Vincent Van Gogh

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„I see by your eagerness, and the wonder and hope which your eyes express, my friend, that you expect to be in formed of the secret with which I am acquainted. That cannot be.“
— Mary Wollstonecraft Shelley
„I am fascinated by Spinoza's pantheism, but I admire even more his contribution to modern thought because he is the first philosopher to deal with the soul and body as one, and not two separate things.“
— Albert Einstein