I've always liked §295 of The Gay Science where Nietzsche makes the distinction between "brief" and "enduring" habits:
"I love brief habits and consider them an inestimable means for getting to know many things and states, down to the bottom of their sweetness and bitternesses...
Enduring habits I hate, and I feel as if a tyrant had come near me and as if the air I breathe had thickened when events take such a turn that it appears that they will inevitably give rise to enduring habits...
Most intolerable, to be sure, and the terrible par excellence would be for me a life entirely devoid of habits, a life that would demand perpetual improvisation. That would be my exile and my Siberia."
"I love brief habits and consider them an inestimable means for getting to know many things and states, down to the bottom of their sweetness and bitternesses...
Enduring habits I hate, and I feel as if a tyrant had come near me and as if the air I breathe had thickened when events take such a turn that it appears that they will inevitably give rise to enduring habits...
Most intolerable, to be sure, and the terrible par excellence would be for me a life entirely devoid of habits, a life that would demand perpetual improvisation. That would be my exile and my Siberia."
(http://clichereality.blogspot.com/2009/07/philosopher-as-tra...)