A little knowledge that acts is worth infinitely more than much knowledge that is idle.
Necessity is the mother of invention.
The delight of opening a new pursuit, or a new course of reading, imparts the vivacity and novelty of youth even to old age.
A thought is an idea in transit.
A child educated only at school is an uneducated child.
The whole of science is nothing more than a refinement of everyday thinking.
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.
If you can't explain it simply, you don't understand it well enough.
The real solution lies in a world in which charity will have become unnecessary.
If one cannot enjoy reading a book over and over again, there is no use in reading it at all.
The first idea the child must acquire is that of the difference between good and evil.
God created man in His own image, says the Bible; philosophers reverse the process: they create God in theirs.
A child miseducated is a child lost.
Learn as though you would never be able to master it; hold it as though you would be in fear of losing it.
Opinion is the medium between knowledge and ignorance.
A witty saying proves nothing.
If help and salvation are to come, they can only come from the children, for the children are the makers of men.
Education is the most powerful weapon which you can use to change the world.
I prefer the company of peasants because they have not been educated sufficiently to reason incorrectly.
I am so clever that sometimes I don't understand a single word of what I am saying.
What we know is a drop, what we don't know is an ocean.