Seeing the light is a choice, not seeing the light is no choice.
As the fly bangs against the window attempting freedom while the door stands open, so we bang against death ignoring heaven.
Thought precedes action, action does not always precede thought.
It's not a question of happiness, it's a requirement. Consider the alternative.
While seeking revenge, dig two graves - one for yourself.
Life is good when we think it's good. Life is bad when we don't think.