To take what you know for what you know, and what you do not know for what you do not know, that is knowledge indeed.
Can there be a love which does not make demands on its object?
To think twice is quite enough.
Not knowing life, how can we know death? Why talk of spirits when you do not understand men?
Be not ashamed of mistakes and thus make them crimes.
If a man takes no thought about what is distant, he will find sorrow near at hand.