What then does Christian faith say to this? It opens its eyes, looks upon all these insignificant, distasteful, and despised duties in the Spirit, and is aware that they are all adorned with divine approval as with the costliest gold and jewels. It says, “O God, because I am certain that you have created me as a man and have from my body begotten this child, I also know for certain that it meets with your perfect pleasure. I confess to you that I am not worthy to rock this little babe or wash its diapers. Or to be entrusted with the care of the child and its mother. How is it that I, without any merit, have come to this distinction of being certain that I am serving your creature and your most precious will? O how gladly will I do so, though the duties should be even more insignificant and despised. Neither frost nor heat, neither drudgery nor labor, will distress or dissuade me, for I am certain that it is thus pleasing in your sight.”

God, with all his angels and creatures, is smiling, not because that father is washing diapers, but because he is doing so in Christian faith.

Luther’s Works 45, p. 39–40. “The Estate of Marriage.” Via my friend Matt Crutchmer.