“…If you’ve ever played a musical instrument, you know that when you rehearsed your sheet music just enough so you made no mistakes, you were practicing to the point of comfort; you could wing it when playing for your teacher.  But under the stress of a recital, you might forget parts of the piece.  Professional musicians, however, go a crucial step further:  They rehearse and rehearse, and then rehearse some more.  They practice until the fingering of their instrument or breathing is automatic.  They practice until they can play it without thinking about it and can just feel it.”  (via Primal Leadership)