生きることは苦しむこと。

to live; to exist; to make a living; to subsist; to be in effect; to be in use; to function; to come to life; to be enlivened; to be safe (in baseball, go, etc.)

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 suffer; to groan; to be worried