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May it please our great Author that I may demonstrate the nature of man and his customs, in the way I describe his figure.
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To manage the large mould make a model of the small mould, make a small room in proportion.
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I am not to blame for putting forward, in the course of my work on science, any general rule derived from a previous conclusion.
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Constancy does not begin, but is that which perseveres.
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The memory of benefits is a frail defence against ingratitude.
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A shadow will appear dark in proportion to the brilliancy of the light surrounding it and conversely it will be less conspicuous where it is seen against a darker background.
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One who by himself is mild enough and void of all offence will become terrible and fierce by being in bad company, and will most cruelly take the life of many men, and would kill many more if they were not hindered by bodies having no soul, that have come out of caverns - that is, breastplates of iron.
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As a day well spent procures a happy sleep, so a life well employed procures a happy death.
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Obstacles cannot crush me. Every obstacle yields to stern resolve. He who is fixed to a star does not change his mind.
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Sculptured figures which appear in motion, will, in their standing position, actually look as if they were falling forward.
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There will be many which will increase in their destruction.
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Just as eating against one’s will is injurious to health, so studying without a liking for it spoils the memory, and it retains nothing it takes in.1
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Light is the chaser away of darkness. Shade is the obstruction of light. Primary light is that which falls on objects and causes light and shade. And derived lights are those portions of a body which are illuminated by the primary light. A primary shadow is that side of a body on which the light cannot fall.
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I have seen motions of the air so furious that they have carried, mixed up in their course, the largest trees of the forest and whole roofs of great palaces, and I have seen the same fury bore a hole with a whirling movement digging out a gravel pit, and carrying gravel, sand and water more than half a mile through the air.
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The false interpreters of nature declare that quicksilver is the common seed of every metal, not remembering that nature varies the seed according to the variety of the things she desires to produce in the world.
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Whoever in discussion adduces authority uses not intellect but rather memory.
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Nothing is that which fills no space. If one single point placed in a circle may be the starting point of an infinite number of lines, and the termination of an infinite number of lines, there must be an infinite number of points separable from this point, and these when reunited become one again; whence it follows that the part may be equal to the whole.
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We see the most striking example of humility in the lamb which will submit to any animal; and when they are given for food to imprisoned lions they are as gentle to them as to their own mother, so that very often it has been seen that the lions forbear to kill them.
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Fire destroys all sophistry, that is deceit; and maintains truth alone, that is gold.
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Painting is poetry which is seen and not heard, and poetry is a painting which is heard but not seen. These two arts, you may call them both either poetry or painting, have here interchanged the senses by which they penetrate to the intellect.
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Human subtlety...will never devise an invention more beautiful, more simple or more direct than does nature, because in her inventions nothing is lacking, and nothing is superfluous.
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Science, knowledge of the things that are possible present and past; prescience, knowledge of the things which may come to pass.
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It is easier to resist at the beginning than at the end.
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When you represent in your work shadows which you can only discern with difficulty, and of which you cannot distinguish the edges so that you apprehend them confusedly, you must not make them sharp or definite lest your work should have a wooden effect.