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" Every action needs to be prompted by a motive. "

Leonardo da Vinci

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" To such an extent does nature delight and abound in variety that among her trees there is not one plant to be found which is exactly like another; and not only among the plants, but among the boughs, the leaves and the fruits, you will not find one which is exactly similar to another. "

Leonardo da Vinci

" The painter who draws merely by practice and by eye, without any reason, is like a mirror which copies every thing placed in front of it without being conscious of their existence. "

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" The greatest deception men suffer is from their own opinions. "

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" Just as courage imperils life, fear protects it. "

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" In order to arrive at knowledge of the motions of birds in the air, it is first necessary to acquire knowledge of the winds, which we will prove by the motions of water in itself, and this knowledge will be a step enabling us to arrive at the knowledge of beings that fly between the air and the wind. "

Leonardo da Vinci

" Learning never exhausts the mind. "

Leonardo da Vinci

" All knowledge which ends in words will die as quickly as it came to life, with the exception of the written word: which is its mechanical part. "

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" Experience never errs; it is only your judgments that err by promising themselves effects such as are not caused by your experiments. "

Leonardo da Vinci

" I have always felt it is my destiny to build a machine that would allow man to fly. "

Leonardo da Vinci

" Science is the captain, and practice the soldiers. "

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" Each man is always in the middle of the surface of the earth and under the zenith of his own hemisphere, and over the centre of the earth. "

Leonardo da Vinci

" The poet ranks far below the painter in the representation of visible things, and far below the musician in that of invisible things. "

Leonardo da Vinci

" Iron rusts from disuse; water loses its purity from stagnation... even so does inaction sap the vigor of the mind. "

Leonardo da Vinci

" Our body is dependant on Heaven and Heaven on the Spirit. "

Leonardo da Vinci

" Necessity is the mistress and guide of nature. Necessity is the theme and inventress of nature, her curb and her eternal law. "

Leonardo da Vinci

" Weight, force and casual impulse, together with resistance, are the four external powers in which all the visible actions of mortals have their being and their end. "

Leonardo da Vinci

" I have found that, in the composition of the human body as compared with the bodies of animals, the organs of sense are duller and coarser. Thus, it is composed of less ingenious instruments, and of spaces less capacious for receiving the faculties of sense. "

Leonardo da Vinci

" Nature is the source of all true knowledge. She has her own logic, her own laws, she has no effect without cause nor invention without necessity. "

Leonardo da Vinci

" The beginnings and ends of shadow lie between the light and darkness and may be infinitely diminished and infinitely increased. Shadow is the means by which bodies display their form. The forms of bodies could not be understood in detail but for shadow. "

Leonardo da Vinci

" Knowledge of the past and of the places of the earth is the ornament and food of the mind of man. "

Leonardo da Vinci

" He who is fixed to a star does not change his mind. "

Leonardo da Vinci

" As every divided kingdom falls, so every mind divided between many studies confounds and saps itself. "

Leonardo da Vinci

" Man and animals are in reality vehicles and conduits of food, tombs of animals, hostels of Death, coverings that consume, deriving life by the death of others. "

Leonardo da Vinci

" Life well spent is long. "

Leonardo da Vinci

" The function of muscle is to pull and not to push, except in the case of the genitals and the tongue. "

Leonardo da Vinci

" Many are they who have a taste and love for drawing, but no talent; and this will be discernible in boys who are not diligent and never finish their drawings with shading. "

Leonardo da Vinci

" Time abides long enough for those who make use of it. "

Leonardo da Vinci

" Marriage is like putting your hand into a bag of snakes in the hope of pulling out an eel. "

Leonardo da Vinci

" All our knowledge has its origins in our perceptions. "

Leonardo da Vinci

" Beyond a doubt truth bears the same relation to falsehood as light to darkness. "

Leonardo da Vinci