It isn't what we don't know that gives us trouble, it's what we know that ain't so.
Know what you are talking about.
As we acquire more knowledge, things do not become more comprehensible but more mysterious.
If the facts don't fit the theory, change the facts.
To educate a person in the mind but not in morals is to educate a menace to society.
The man who is fond of books is usually a man of lofty thought, and elevated opinions.
Although modesty is natural to man, it is not natural to children. Modesty only begins with the knowledge of evil.
The only good is knowledge and the only evil is ignorance.
The idea is to try to give all the information to help others to judge the value of your contribution; not just the information that leads to judgment in one particular direction or another.
What is freedom of expression? Without the freedom to offend, it ceases to exist.
Just because I don't care doesn't mean I don't understand.
Liberty without Learning is always in peril and Learning without Liberty is always in vain.
No man's knowledge here can go beyond his experience.
Courage, conviction and confidence.
Investigate, educate and organize.
If you want the present to be different from the past, study the past.
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.
Education is the ability to listen to almost anything without losing your temper or your self-confidence.
Men are born ignorant, not stupid. They are made stupid by education.
The deepest sin against the human mind is to believe things without evidence.
The schools ain't what they used to be and never was.