Confidence
A drug of the mind. Too much has you flying high until the artillery of disappointment shoots you down to a fiery crash.
Too little and you are left unsure of yourself. You end up surprised when accomplishment offers a hand up only for you to step down and hide your light again.
Just enough lets you be sure of yourself. It let's you fly just high enough that a crash will hurt, but not destroy, and where accomplishment need only say, "step forward and shine!"