No human investigation can be called real science if it cannot be demonstrated mathematically.
We ought not to desire the impossible.
The good painter must paint two things: a person and the essence of his soul.
I shall do down in history as the man who opened a door!
Threats alone, are the weapons of the threatened man.
True and great love springs out of great knowledge, and where you know little you can love but little or not at all.
I have been impressed with the urgency of doing.
The grave will fall in upon him who digs it.
The spirit desires to remain with its body, because, without the organic instruments of that body, it can neither act, nor feel anything.
Let no man who is not a Mathematician read the elements of my work.
The painter's mind is a copy of the divine mind, since it operates freely in creating the many kinds of animals, plants, fruits, landscapes, countrysides, ruins, and awe-inspiring places.
Although nature commences with reason and ends in experience it is necessary for us to do the opposite, that is to commence with experience and from this to proceed to investigate the reason.
Therefore, O students, study mathematics and do not build without foundations.
You can have no dominion greater or less than that over yourself.
The Book of the science of Mechanics must precede the Book of useful inventions.
Fear arises sooner than anything else.
There is nothing that deceives us more than our own judgment when used to give an opinion on our own works. It is sound in judging the work of our enemies but not that of our friends, for hate and love are two of the most powerfully motivating factors found among living things.
The desire to know is natural to good men.
You will never have a greater or lesser dominion than that over yourself.
I am never weary of being useful... In serving others I cannot do enough. No labor is sufficient to tire me.
Men of genius sometimes accomplish most when they work least, for they are thinking out inventions.
I know very well that because I am unlettered some presumptuous people will think they have the right to criticize me, saying that I am an uncultured man. What stupid fools! Do they not know that I could reply to them as Marius did to the Roman patricians: "Do those who pride themselves on the works of other men claim to challenge mine?
Nature is full of infinite causes that have never occurred in experience.
Life, when is spent well, is long.
Here is a thing which the more it is needed the more it is rejected: and this is advice, which is unwillingly heeded by those who most need it, that is to say, by the ignorant.
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