Proverbs 27:19-21

As in water face reflects face, So the heart of man reflects man. Sheol (the place of the dead) and Abaddon (the underworld) are never satisfied; Nor are the eyes of man ever satisfied. [Prov 30:16; Hab 2:5] The refining pot is for silver and the furnace for gold [to separate the impurities of the metal], And each is tested by the praise given to him [and his response to it, whether humble or proud].