The key to contentedness is ...

The key to contentedness is not the absence of work; neither is it to cap each day with the witless abandon of hollow entertainment, but to fill your days with that which fills your life with meaning.
 Andrew Williams

Quotes from the same author

The famous names throughout history-be they heroes or villains-if they accomplished anything notable, they were passionate. Passion is what drives those who accomplish momentous feats, for good or evil.
 Andrew Williams