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" He who loves practice without theory is like the sailor who boards ship without a rudder and compass and never knows where he may cast. "

Leonardo da Vinci

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" Just as food eaten without appetite is a tedious nourishment, so does study without zeal damage the memory by not assimilating what it absorbs. "

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" 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. "

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

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" He who wishes to be rich in a day will be hanged in a year. "

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" Poor is the pupil who does not surpass his master. "

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" Tears come from the heart and not from the brain. "

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" For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return. "

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

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" As a well-spent day brings happy sleep, so a life well spent brings happy death. "

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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. "

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" A beautiful body perishes, but a work of art dies not. "

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

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

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

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" 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. "

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" The natural desire of good men is knowledge. "

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

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" 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. "

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

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" Time stays long enough for anyone who will use it. "

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" People talk to people who perceive nothing, who have open eyes and see nothing; they shall talk to them and receive no answer; they shall adore those who have ears and hear nothing; they shall burn lamps for those who do not see. "

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" Nothing strengthens authority so much as silence. "

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" 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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" Who sows virtue reaps honor. "

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" The divisions of Perspective are 3, as used in drawing; of these, the first includes the diminution in size of opaque objects; the second treats of the diminution and loss of outline in such opaque objects; the third, of the diminution and loss of colour at long distances. "

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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. "

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