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.
A bad feeling is a commotion of the mind repugnant to reason, and against nature.
Man conquers the world by conquering himself.
Steel your sensibilities, so that life shall hurt you as little as possible.