He who guards his secrets retains control in his own hands
He who understands humanity seeks solitude
Lead such a life, that, when you die, the people may mourn you, and while you are alive they long for your company.
Do not let your difficulties fill you with anxiety, after all it is only in the darkest nights that stars shine more brightly.
A man's worth depends upon the nobility of his aspirations.
Knowledge is of two kinds: that which is absorbed and that which is heard. And that which is heard does not profit if it is not absorbed.