en_tn/pro/30/12.md

a generation that is

"a generation of people that are"

is pure in their own eyes

The eyes represent seeing, and seeing represents thoughts or judgment. Alternate translation: "considers themselves pure" or "believes they are pure" (See: rc://en/ta/man/jit/figs-metaphor)

they are not washed of their filth

The words "washed" and "filth" speak of God forgiving people who sin as if he were washing physical filth off of the people. This can be translated in active form. Alternate translation: "God has not forgiven them of their sins" (See: rc://en/ta/man/jit/figs-metaphor and rc://en/ta/man/jit/figs-activepassive)

filth

This should be translated with a polite term that includes human or animal vomit and waste.