Surely the churning of milk bringeth forth butter, and the wringing of the nose bringeth forth blood: so the forcing of wrath bringeth forth strife.

The wringing of the nose bringeth forth blood

The churning separates the butter from the milk. In the same manner, through cosmic processes and upheavals of heat and cold, the Five Fundamental Elements (earth, water, fire, air, and space) were separated and Earth, this Ball of Butter, emerged as the product of the churning. If any person or thing has one of the three character-traits (balanced, passionate, dull) predominant in the makeup, we denote him as having that trait.

Doing your return manually is akin to churning your own butter.

And he took butter, and milk, and the calf which he had dressed, and set it before them; and he stood by them under the tree, and they did eat.

We have to keep churning.