Believe those who seek the truth, doubt those who find it; doubt all, but do not doubt yourself.
The only real education comes from what goes counter to you.
What another would have done as well as you, do not do it. What another would have said as well as you, do not say it; what another would have written as well, do not write it. Be faithful to that which exists nowhere but in yourself - and thus make yourself indispensable.
I find just as much profit in cultivating my hates as my loves.
Nothing prevents happiness like the memory of happiness.
It would be wisest not to worry too much about the sterile periods. They ventilate the subject and instill into it the reality of daily life.