The following is an excerpt from a satirical work written in 1515 and titled The Letters of Obscure Men. The two authors were Ulrich von Hutten and Crotus Rubeanus.
For you must know that we were lately sitting in an inn, having our supper, and were eating eggs, when on opening one, I saw that there was a young chicken within.
This I showed to a comrade; whereupon quoth he to me, “Eat it up speedily, before the taverner sees it, for if he mark it, you will have to pay for a fowl.”
In a trice I gulped down the egg, chicken and all. And then I remembered that it was Friday!
Whereupon I said to my crony, “You have made me commit a mortal sin, in eating flesh on the sixth day of the week!”
But he averred that it was not a mortal sin—nor even a venial one, seeing that such a chickling is accounted merely as an egg, until it is born.
Then I departed, and thought the matter over.
And by the Lord, I am in a mighty quandary, and know not what to do.
It seemeth to me that these young fowls in eggs are flesh, because their substance is formed and fashioned into the limbs and body of an animal, and possesseth a vital principle.
It is different in the case of grubs in cheese, and suchlike, because grubs are accounted fish, as I learnt from a physician who is also skilled in Natural Philosophy.
Most earnestly do I entreat you to resolve the question that I have propounded. For if you hold that the sin is mortal, then, I would fain get shrift here, ere I return to Germany.