" I’ve been struck by the paradoxes I kept confronting. The opposite of a great truth is also true. I try to embrace these contradictions:

1. Accept yourself, but expect more of yourself.
2. Keep an empty shelf, and keep a junk drawer.
3. Take yourself less seriously—and take yourself more seriously. 
4. Use your time efficiently, yet make time to play, to wander, to read at whim, to fail.
5. Think about yourself so you can forget yourself. 
6. The days are long, but the years are short.

Often, the search for happiness means understanding both sides of the contradiction".

-- Gretchen Rubin, the Happiness Project