en_tn_lite_do_not_use/pro/27/17.md

Iron sharpens iron; in the same way, a man sharpens his friend.

These two phrases are comparing how iron and a man can be improved. Alternate translation: "As iron can sharpen another piece of iron, so a man's character is improved by contact with his friend" (See: rc://en/ta/man/jit/figs-simile)