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“No impetus created by any movement whatever can be immediately consumed, but if it finds an object which has a great resistance it consumes itself in a reflex movement.”

Leonardo Da Vinci

The Notebooks of Leonardo Da Vinci (1938), XVII Flight

“Fire may be represented as the destroyer of all sophistry, and as the image and demonstration of truth; because it is light and drives out darkness which conceals all essences”

Leonardo Da Vinci

or subtle things
The Notebooks of Leonardo da Vinci (1883), X Studies and Sketches for Pictures and Decorations

“It is ill to praise, and worse to reprimand in matters that you do not understand.”

Leonardo Da Vinci

The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.
Variant: You do ill if you praise, and still worse if you reprove in a matter you do not understand.

“Beyond a doubt truth bears the same relation to falsehood as light to darkness; and this truth is in itself so excellent that, even when it dwells on humble and lowly matters, it is still infinitely above uncertainty and lies, disguised in high and lofty discourses; because in our minds, even if lying should be their fifth element, this does not prevent that the truth of things is the chief nutriment of superior intellects, though not of wandering wits. But you who live in dreams are better pleased by the sophistical reasons and frauds of wits in great and uncertain things, than by those reasons which are certain and natural and not so far above us.”

Leonardo Da Vinci

The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.

“Every body in light and shade fills the surrounding air with infinite images of itself; and these, by infinite pyramids diffused in the air, represent this body throughout space and on every side.”

Leonardo Da Vinci

The Notebooks of Leonardo da Vinci (1883), II Linear Perspective

“All the rays which convey the images of objects through the air are straight lines. Hence, if the images of very large bodies have to pass through very small holes, and beyond these holes recover their large size, the lines must necessarily intersect.”

Leonardo Da Vinci

The Notebooks of Leonardo da Vinci (1883), II Linear Perspective

“Fire is to represent truth because it destroys all sophistry and lies; and the mask is for lying and falsehood which conceal truth.”

Leonardo Da Vinci

The Notebooks of Leonardo da Vinci (1883), X Studies and Sketches for Pictures and Decorations

“If you transmit the rays of the sun through a hole in the shape of a star you will see a beautiful effect of perspective in the spot where the sun's rays fall.”

Leonardo Da Vinci

The Notebooks of Leonardo da Vinci (1883), III Six books on Light and Shade

“Things that are separate shall be united and acquire such virtue that they will restore to man his lost memory.”

Leonardo Da Vinci

Of papyrus
The Notebooks of Leonardo da Vinci (1883), XX Humorous Writings

“Like a whirling wind which rushes down a sandy and hollow valley, and which, in its hasty course, drives to its centre every thing that opposes its furious course… No otherwise does the Northern blast whirl round in its tempestuous progress…”

Leonardo Da Vinci

The Notebooks of Leonardo da Vinci (1883), XXI Letters. Personal Records. Dated Notes.

“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.”

Leonardo Da Vinci

http://books.google.com/books?id=lFXyZLM1XxYC&pg=PT412&dq=%22Just+as+eating+against+one%E2%80%99s+will+is+injurious+to+health%22&hl=en&ei=GFRbTIjiGoL-8AbytdC4Ag&sa=X&oi=book_result&ct=result&resnum=2&ved=0CDUQ6AEwAQ#v=onepage&q=%22Just%20as%20eating%20against%20one%E2%80%99s%20will%20is%20injurious%20to%20health%22&f=false
The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.

“Seeing that I can find no subject specially useful or pleasing — since the men who have come before me have taken for their own every useful or necessary theme — I must do like one who, being poor, comes last to the fair, and can find no other way of providing himself than by taking all the things already seen by other buyers, and not taken but refused by reason of their lesser value. I, then, will load my humble pack with this despised and rejected merchandise, the refuse of so many buyers; and will go about to distribute it, not indeed in great cities, but in the poorer towns, taking such a price as the wares I offer may be worth.”

Leonardo Da Vinci

The Notebooks of Leonardo da Vinci (1883), I Prolegomena and General Introduction to the Book on Painting

“The grave will fall in upon him who digs it.”

Leonardo Da Vinci

The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.

“Darkness is absence of light. Shadow is diminution of light.”

Leonardo Da Vinci

The Notebooks of Leonardo da Vinci (1883), III Six books on Light and Shade

“Perspective is nothing more than a rational demonstration applied to the consideration of how objects in front of the eye transmit their image to it, by means of a pyramid of lines. The Pyramid is the name I apply to the lines which, starting from the surface and edges of each object, converge from a distance and meet in a single point.”

Leonardo Da Vinci

The Notebooks of Leonardo da Vinci (1883), II Linear Perspective