We gain our first measure of intelligence when we first admit our own ignorance.
It is better to change an opinion than to persist in a wrong one.
Contentment is natural wealth, luxury is artificial poverty.
Only the extremely ignorant or the extremely intelligent can resist change.
Sometimes you put walls up not to keep people out, but to see who cares enough to break them down.
The only good is knowledge and the only evil is ignorance.
Be kind, for everyone you meet is fighting a hard battle.
The unexamined life is not worth living.
He who is not contented with what he has, would not be contented with what he would like to have.
We can easily forgive a child who is afraid of the dark; the real tragedy of life is when men are afraid of the light.