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The variety of colour in objects cannot be discerned at a great distance, excepting in those parts which are directly lighted up by the solar rays.
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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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Constancy does not begin, but is that which perseveres.
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He who does not value life does not deserve it.
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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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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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There will be many which will increase in their destruction.
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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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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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As a day well spent procures a happy sleep, so a life well employed procures a happy death.
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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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There is no certainty in sciences where one of the mathematical sciences cannot be applied, or which are not in relation with these mathematics.
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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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Whoever in discussion adduces authority uses not intellect but rather memory.
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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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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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It is easier to contend with evil at the first than at the last.
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It is easier to resist at the beginning than at the end.
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Fire destroys all sophistry, that is deceit; and maintains truth alone, that is gold.
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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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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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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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An infinite number of men will sell publicly and unhindered things of the very highest price, without leave from the Master of it; while it never was theirs nor in their power; and human justice will not prevent it.