I don't own any of these quotes, they're all said by Leonardo Da Vinci

Simplicity is the ultimate sophistication.
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When once you have tasted flight, you will forever walk the earth with your eyes turned skyward, for there you have been, and there you will always long to return.
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Art is never finished, only abandoned.
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Painting is poetry that is seen rather than felt, and poetry is painting that is felt rather than seen.
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The human foot is a masterpiece of engineering and a work of art.
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It had long since come to my attention that people of accomplishment rarely sat back and let things happen to them.
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They went out and happened to things.
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Learning never exhausts the mind.
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I have been impressed with the urgency of doing. Knowing is not enough; we must apply. Being willing is not enough; we must do.
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As a well-spent day brings happy sleep, so a life well spent brings happy death.
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Water is the driving force of all nature.
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The smallest feline is a masterpiece.
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Where the spirit does not work with the hand, there is no art.
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There are three classes of people: those who see, those who see when they are shown, those who do not see.
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The noblest pleasure is the joy of understanding.
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All our knowledge has its origins in our perceptions.
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The greatest deception men suffer is from their own opinions.
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Iron rusts from disuse; stagnant water loses its purity and in cold weather becomes frozen; even so does inaction sap the vigor of the mind.
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I have offended God and mankind because my work didn't reach the quality it should have.
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While I thought that I was learning how to live, I have been learning how to die.
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Nothing strengthens authority so much as silence.
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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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He who does not punish evil, commands it to be done.
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Why does the eye see a thing more clearly in dreams than the imagination when awake?
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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.
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Time stays long enough for anyone who will use it.
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Study without desire spoils the memory, and it retains nothing that it takes in.
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It is easier to resist at the beginning than at the end.
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In rivers, the water that you touch is the last of what has passed and the first of that which comes; so with present time.
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Our life is made by the death of others.
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Anyone who conducts an argument by appealing to authority is not using his intelligence; he is just using his memory.
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Blinding ignorance does mislead us. O! Wretched mortals, open your eyes!
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You do ill if you praise, but worse if you censure, what you do not understand.
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The truth of things is the chief nutriment of superior intellects.
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Poor is the pupil who does not surpass his master.
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Where there is shouting, there is no true knowledge.
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Marriage is like putting your hand into a bag of snakes in the hope of pulling out an eel.
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Men of lofty genius when they are doing the least work are most active.
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Nothing can be loved or hated unless it is first understood.
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Nature never breaks her own laws.
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He who wishes to be rich in a day will be hanged in a year.
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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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God sells us all things at the price of labor.
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You can have no dominion greater or less than that over yourself.
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Experience does not err. Only your judgments err by expecting from her what is not in her power.
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Beyond a doubt truth bears the same relation to falsehood as light to darkness.
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As every divided kingdom falls, so every mind divided between many studies confounds and saps itself.
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Common Sense is that which judges the things given to it by other senses.
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Just as courage imperils life, fear protects it.
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Necessity is the mistress and guide of nature. Necessity is the theme and inventress of nature, her curb and her eternal law.
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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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Just as iron rusts from disuse, even so does inaction spoil the intellect.