When I really worry about something, I don’t just fool around. I even have to go to the bathroom when I worry about something. Only, I don’t go. I’m too worried to go. I don’t want to interrupt my worrying to go.
~J.D. Salinger, The Catcher in the Rye
“Resist much. Obey little.”
— WALT WHITMAN
“I exist as I am, that is enough,
If no other in the world be aware I sit content,
And if each and all be aware I sit content.
One world is aware, and by the far the largest to me, and that is myself,
And whether I come to my own today or in ten thousand or ten million years,
I can cheerfully take it now, or with equal cheerfulness, I can wait.”
— Walt Whitman
Keep your eyes on the stars, and your feet on the ground.
–Theodore Roosevelt
79 Sparrows 
That last one from Roosevelt will take a person far.