Tertullian

“ This, then, must be the soul-producing seed, which arises at once from the out-drip of the soul, just as that fluid is the body-producing seed which proceeds from the drainage of the flesh. Most true are the examples of the first creation. Adam’s flesh was formed of clay. Now what is clay but an excellent moisture, whence should spring the generating fluid? From the breath of God first came the soul. But what else is the breath of God than the vapour of the spirit, whence should spring that which we breathe out through the generative fluid? ”

“ The entire man being excited by the one effort of both natures, his seminal substance is discharged, deriving its fluidity from the body, and its warmth from the soul. Now if the soul in Greek is a word which is synonymous with cold, [6] how does it come to pass that the body grows cold after the soul has quitted it? Indeed (if I run the risk of offending modesty even, in my desire to prove the truth) , I cannot help asking, whether we do not, in that very heat of extreme gratification when the generative fluid is ejected, feel that somewhat of our soul has gone from us? ”

“ Forasmuch, therefore, as these two different and separate substances, the clay and the breath, combined at the first creation in forming the individual man, they then both amalgamated and mixed their proper seminal rudiments in one, and ever afterwards communicated to the human race the normal mode of its propagation, so that even now the two substances, although diverse from each other, flow forth simultaneously in a united channel; and finding their way together into their appointed seed-plot, they fertilize with their combined vigour the human fruit out of their respective natures. ”

“ And inherent in this human product is his own seed, according to the process which has been ordained for every creature endowed with the functions of generation. Accordingly from the one (primeval) man comes the entire outflow and redundance of men’s souls—nature proving herself true to the commandment of God, “Be fruitful, and multiply.” ”

“ It is lust, not natural usage, which has brought shame on the intercourse of the sexes. It is the excess, not the normal state, which is immodest and unchaste: the normal condition has received a blessing from God, and is blest by Him: “Be fruitful, and multiply, (and replenish the earth.) ”