Henri Frederic Amiel

The essence of America - that which really unites us - is not ethnicity, or nationality or religion - it is an idea - and what an idea it is: That you can come from humble circumstances and do great things.

Sometimes it's even hard to tell the difference between a tic and a compulsion. But while tics stem from an urge in a specific part of the body - either completely unconsciously or through a premonitory sensation that's satisfied only by the tic - OCD bubbles up as conscious thoughts in the mind.