“What, then, is the reason for this remarkable procreation? The hen lays an egg; this she keeps warm while a living body comes into being in the egg, which the mother later on hatches. The philosophers advance the reason that these events take place through the working of the sun and her belly. I grant this. But the theologians say, far more reliably, that these events take place through the working of the Word, because it is said here: “He blessed them and said: ‘Increase and multiply.’ ” This Word is present in the very body of the hen and in all living creatures; the heat with which the hen keeps her eggs warm is the result of the divine Word, because if it were without the Word, the heat would be useless and without effect.” Luther’s Works, Vol. 1, Lectures on Genesis, Ch. 1:22. http://biblia.com/books/lw01/offset/164124 via the Logos Bible Android app.