Any knowledge that doesn't lead to new questions quickly dies out: it fails to maintain the temperature required for sustaining life.
All knowledge that the world has ever received comes from the mind; the infinite library of the universe is in our own mind.
Although modesty is natural to man, it is not natural to children. Modesty only begins with the knowledge of evil.
Books are as useful to a stupid person as a mirror is useful to a blind person.
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.
If you can't explain it simply, you don't understand it well enough.
The books that the world calls immoral are books that show the world its own shame.
Learning gives creativity, Creativity leads to thinking, Thinking provides knowledge, Knowledge makes you great.
Most people have never learned that one of the main aims in life is to enjoy it.
I learned very early the difference between knowing the name of something and knowing something.
I think that kids have a greater capacity for processing things than we give them credit for.
What is freedom of expression? Without the freedom to offend, it ceases to exist.
Don't worry that children never listen to you; worry that they are always watching you.
Science is not only a disciple of reason but, also, one of romance and passion.
Knowledge becomes evil if the aim be not virtuous.
You can never learn less, you can only learn more.
The first idea the child must acquire is that of the difference between good and evil.
The deepest sin against the human mind is to believe things without evidence.
What we know is a drop, what we don't know is an ocean.
No power and no treasure can outweigh the extension of our knowledge.
Common sense is the collection of prejudices acquired by age eighteen.