君は精神を養わなくてはならない。

you; buddy; pal; monarch; ruler; sovereign; (one's) master

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

mind; soul; heart; spirit; intention

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to support; to maintain; to provide for; to bring up; to raise; to rear; to feed; to adopt (a child); to cultivate (a habit, a quality, etc.); to develop; to build up; to recuperate (from injury, illness, etc.)

if ... then; when; and; why don't you...?; the more (one does something); because; since