Blind Human Nature

No longer walk as the Gentiles do, in the futility of their minds. They are darkened in their understanding, alienated from the life of God because of the ignorance that is in them, due to their hardness of heart.
EPHES1ANS 4:17-18
Blind Human Nature
But in divine things, which have to do with Cod and in which we must act in such a way that God is pleased and we are saved, there our nature is so utterly blind that it cannot point out even the least bit of what those things are. It is so arrogant that it makes up its mind and rushes in like a blind horse, but everything it decides and concludes is as false and erroneous as God is alive. It acts like the man who builds on sand. It wants to make a coat out of a spiderweb, as Isaiah says (Isaiah 59:6). It wants to use sand instead of flour for baking bread. It sows the wind and gathers the whirlwind, as Hosea says (Hosea 8:7). It measures the air with spoons, carries the light into the cellar on a tray, weighs flames on the scales, in everything promoting whatever trifles and absurd games could happen or be invented. It acts as if what it does were the worship of God—but it is not.

From the Church Postil, sermon for Epiphany on Isaiah 60:1-6 (Luther's Works 76:55)
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