חָרָה

From LSJ

ὁ γὰρ μανθάνων κιθαρίζειν κιθαρίζων μανθάνει κιθαρίζειν → he who is learning the harp, learns the harp by harping

Source

English (Strong)

a primitive root (compare חָרַר); to glow or grow warm; figuratively (usually) to blaze up, of anger, zeal, jealousy: be angry, burn, be displeased, X earnestly, fret self, grieve, be (wax) hot, be incensed, kindle, X very, be wroth. See תְּתַחֲרֶה.