Never help a child with a task at which he feels he can succeed.
The most important part of teaching is to teach what it is to know.
Science is not only a disciple of reason but, also, one of romance and passion.
Reading without reflecting is like eating without digesting.
Courage, conviction and confidence.
Human behavior flows from three main sources: desire, emotion, and knowledge
Don't worry that children never listen to you; worry that they are always watching you.
I have no special talents. I am only passionately curious.
Opinion is the medium between knowledge and ignorance.
Any knowledge that doesn't lead to new questions quickly dies out: it fails to maintain the temperature required for sustaining life.
Just because I don't care doesn't mean I don't understand.
In mathematics you don't understand things. You just get used to them.
The ability to observe without evaluating is the highest form of intelligence.
Reading is to the mind what exercise is to the body.
Real knowledge is to know the extent of one's ignorance.
The whole of science is nothing more than a refinement of everyday thinking.
A witty saying proves nothing.
There is nothing more notable in Socrates than that he found time, when he was an old man, to learn music and dancing, and thought it time well spent.
It took us three years to build the NeXT computer. If we'd given customers what they said they wanted, we'd have built a computer they'd have been happy with a year after we spoke to them - not something they'd want now.
It is better to know how to learn than to know.
The first principle is that you must not fool yourself and you are the easiest person to fool.