教える事は学ぶ事である。

to teach; to inform; to instruct

thing; matter; incident; occurrence; event; something serious; trouble; crisis; circumstances; situation; state of affairs; work; business; affair; after an inflectable word, creates a noun phrase indicating something the speaker does not feel close to; nominalizing suffix; pretending to ...; playing make-believe ...; alias; aka; nickname; alternative name; also known as

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

to study (in depth); to learn; to take lessons in

be; is; indicates past or completed action; indicates light imperative

a certain ...; some ...