309.02

Ὁ γὰρ μανθάνων κιθαρίζειν κιθαρίζων μανθάνει κιθαρίζειν.

Aristotle.  Metaphysica, VIII., 8.

He who is learning the harp learns the harp by harping.

ὁ, ἡ, τό, def. article, the. Particle only, he, she, it, they, with participle, the one, the person (who).
μανθάνω, pres. part. μανθάνων, learn. ὁ μανθάνων, the (person) learning, he who is learning.
κιθαρίζω, infin. κιθαρίζειν, play the cithara (harp). κιθαρίζων, pres. part., (while) harping.