Whatever you can do with unhappiness, you can do better when you're happy.
There aren't enough cookies in the world to make you feel loved and whole.
We create other people by how we listen to them
We tend to think only in terms of what we think is plausible that we could pull off and decide that "that's what I want", instead of focusing on "what do I want?" and then figuring out how we could pull it off.
If you are doing things in order to be happy... you're doing them in the wrong order.
The secret of happiness is simply this... your happiness does NOT depend on getting what you want.