Timing.

The receptivity of the artist must never be confused with passivity or laziness.  Receptivity is the artist's holding him or herself alive and open to hear what being may speak.  Such receptivity requires a nimbleness, a fine honed sensitivity in order to let one's self be the vehicle of whatever vision may emerge.  It is the opposite of the authoritarian demands impelled by "will power."  It requires a high degree of attention, as when a diver is poised on the end of a springboard, not jumping but holding his or her muscles in sensitive balance for the right second.  It is an active listening, keyed to hear the answer, alert to to see whatever can bee glimpsed when the vision or the words to come.  It is a waiting for the birthing process to begin to move in its own organic time.  It is necessary that the artist have this sense of timing, that he or she respect these periods of receptivity as part of the mystery of creativity and creation.

Rollo May, from The Courage to Create