Be wise
sakal (saw-kal')
to be (causatively, make or act) circumspect and hence, intelligent
now therefore O ye kings
melek (meh'-lek)
a king -- king, royal.
be instructed
yacar (yaw-sar')
to chastise, literally (with blows) or figuratively (with words); hence, to instruct -- bind, chasten, chastise, correct, instruct, punish, reform, reprove, sore, teach.
ye judges
shaphat (shaw-fat')
to judge, i.e. pronounce sentence (for or against); by implication, to vindicate or punish; by extenssion, to govern; passively, to litigate
of the earth
'erets (eh'-rets)
the earth (at large, or partitively a land) -- common, country, earth, field, ground, land, natins, way, + wilderness, world.