Test knowledge through experience, be prepared to make mistakes, and be persistent about it.
I am not poor. Poor are those who desire many things.
Truth is so excellent, that if it praises but small things they become noble.
All thoughts start from emotions.
The moment is timeless.
To enjoy – to love a thing for its own sake and for no other reason.
It’s not enough that you believe what you see. You must also understand what you see.
I have been impressed with the urgency of doing.
I shall do down in history as the man who opened a door!
The Book of the science of Mechanics must precede the Book of useful inventions.
Movement will fail sooner than usefulness.
If you are representing a white body let it be surrounded by ample space, because as white has no colour of its own, it is tinged and altered in some degree by the colour of the objects surrounding it.
People reveal themselves completely only when they are thrown out of the customary conditions of their life.
Many will think they may reasonably blame me by alleging that my proofs are opposed to the authority of certain men held in the highest reverence by their inexperienced judgments; not considering that my works are the issue of pure and simple experience.
Man’s external form, marvellously constructed, is not much as compared with the divine soul that dwells inside that structure.
Let not your rage or malice destroy a life.
It vexes me greatly that having to earn my living has forced me to interrupt the work and to attend to small matters.
Especially learn how to see.
Depth and strength of a human character are defined by its moral reserves.
A life well used procures a happy death.