Fate is the endless chain of causation, whereby things are; the reason or formula by which the world goes on.
Happiness is a good flow of life.
All things are parts of one single system, which is called nature; the individual life is good when it is in harmony with nature.
Steel your sensibilities, so that life shall hurt you as little as possible.
Man conquers the world by conquering himself.
That which exercises reason is more excellent than that which does not exercise reason; there is nothing more excellent than the universe, therefore the universe exercises reason.