"Fulfillment"

Beast-of-burden rolls easy off the tongue. It evokes images of the awe-some (in its former sense), of large powerful creatures that would leave one in awe. Tall and muscular with hind legs made for plowing and planting. Animals like elephants, camels, horses who transport hard, heavy loads on their back.

It is simpler to acknowledge ones likeness to these beasts should the likeness exist. The acknowledgement makes it possible to accept one purpose, one place. The natural propensity justifies a single-mindedness. You are here to deliver.

Psychologist Mihaly Csikszentmihalyi calls this state "undivided interest" where hobbies meld into work and time loses its tick-tock.