Know that joy is rarer, more difficult, and more beautiful than sadness. Once you make this all-important discovery, you must embrace joy as a moral obligation.

I intend to bring you strength, joy, courage, perspicacity, defiance.

We call "happiness" a certain set of circumstances that makes joy possible. But we call joy that state of mind and emotions that needs nothing to feel happy.

Nothing is more fatal to happiness than the remembrance of happiness.

From the satisfaction of desire there may arise, accompanying joy and as it were sheltering behind it, something not unlike despair.