.—a) Conception (conceptio) may be taken either actively or passively. Active conception (concipere, conceptio activa) is the parental act of generation. Passive conception (concipi, conceptio passiva) is the origin of a human being in the maternal womb. A child comes into being at the moment when the intellectual soul is infused into the product of parental generation (embryo, fœtus). In speaking of the Immaculate
Pages 39–40