I found this on another blog as part of a much longer quote. As an amateur photographer, I immediately appreciated the thought.
"A photographer is always in a state of preparing himself for a given moment… we have only an instant in which to think and act." -Arnold Newman
After you think about it a while, perhaps whatever role we play in life causes us to be always in a state of preparing for a given moment. That is why I grow increasingly impatient with the time-wasters in my life. T.V. comes to mind.