The cornea has no blood vessels. If it did, your vision would be permanently cloudy. But how, then, does it stay alive?

The answer is a fluid pump—built right into the cornea itself. Tiny endothelial cells along the back surface of the cornea form a living pump system that constantly moves water out of the stroma, the thick middle layer. Without this action, fluid would accumulate, scattering light and turning your clear window milky.

It’s not just a matter of staying dry. The balance has to be exact. Too much dehydration, and the cornea becomes brittle and damaged. Too little, and it clouds over. So these pump cells maintain a razor-thin margin of precision, pulling just enough water out while letting nutrients come in from the aqueous humor.

And they never take a break. Unlike some parts of the body that can repair or regrow easily, corneal pump cells are limited in number—and irreplaceable if destroyed.

Imagine if we treated our spiritual transparency the same way. Are we letting in just enough nourishment—Jehovah’s word, loving counsel, upbuilding association—to keep our spiritual sight clear? Are we guarding against anything that might cloud it?