… yea, come, buy wine and milk without money and without price. – Isaiah 55:1

Wine, you know, is a rich thing, something that requires much time to manufacture. There has to be vintage and fermentation and preservation before wine can come to its full flavour. Now, the gospel is like that, it is an extraordinary thing for feast days; it gives a man power to use a vintage of thought, a fermentation of action, and a preservation of experience, till a man’s piety comes forth like the sparkling wine that makes the heart leap with gladness. There is that, I say, in religion, that makes it an extraordinary thing, a thing for rare occasions, to be brought out when princes sit at the table. But milk is an ordinary thing; you get it every day, anywhere. If you just run out into the farm yard there it is; there is no preparation required. it is ready to the hand. It is an ordinary thing. So is it with the gospel: it is a thing for every day. I love the gospel on Sunday, but, blessed be God, it is a Monday gospel too. The gospel is a thing for the chapel, and it is a thing for the church, there it is like wine. But it is a thing for the farm yard, it is a thing which you may observe behind the plough, and from behind the counter. The religion of Christ is a thing that will go with you into your shop, on to the Exchange, into the market, everywhere. It is like milk-an everyday dish-a thing which we may always have, and upon which we may always feast. Oh! thank heaven, there is wine for that high day when we shall see the Saviour face to face; there is wine for that dread day when we shall ford the stream of Jordan-wine that shall remove our fears and bid us sing in the midst of the dark billows of Death: but thanks be unto Him, there is milk too-milk for everyday occurrences, for every-day actions, milk for us to drink as long as we live, and milk to cherish us till the last great day shall come. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0199.cfm