You can't make it turn sweet again. Once it was an innocent color like the flowers of wild strawberries, and its texture was simple would pass through a clean cheesecloth, its taste was fresh. And now with nothing more guilty that the passage of time to chide it with, the same substance has turned sour and lumpy.
The sour milk makes interesting & delicious doughs, can be carried to a further state of bacterial action to create new foods, can in its own right be considered complicated and more interesting in texture to one who studies it closely, like a map of the world.
But to most of us: it is spoiled. Sour. We throw it out, down the drain-not in the backyard- careful not to spill any because the smell is strong. A good cook would be shocked with the waste. But we do not live in a world of good cooks.
I am the milk. Time passes. You cannot make it turn sweet again. I sit guiltily on the refrigerator shelf trembling with hope for a cook who dreams of waffles, biscuits, dumplings and other delicious breads fearing the modern housewife who will lift me off the shelf and with one deft twist of a wrist... you know the rest.
You are the milk. When it is your turn remember, there is nothing more than the passage of time we can chide you with.