breathing in

inspiration
c.1300, "immediate influence of God or a god," especially that under which the holy books were written, from O.Fr. inspiracion "inhaling, breathing in; inspiration," from L.L. inspirationem (nom. inspiratio), noun of action from pp. stem of L. inspirare "inspire, inflame, blow into," from in- "in" (see in- (2)) + spirare "to breathe" (see spirit). Literal sense "act of inhaling" attested in English from 1560s.

From the Online Etymology Dictionary.