に就て[nitsuite] concerning
に就き[nitsuki] because of
去就[kyoshuu] committing one's self
就いては[tsuiteha] in line with this
就きましては[tsukimashiteha] in line with this

就く[tsuku] to ascend (the throne)
就ける[tsukeru] to install (a king, emperor, etc.)
就学[shuugaku] entering school
就学義務[shuugakugimu] compulsory school attendance
就学児童[shuugakujidou] school child

燕雀鴻鵠[enjakukoukoku] How can a small bird (a sparrow, a petty person) understand the aspirations of a great bird (a phoenix)
鴻基[kouki] foundation of a great project

鴻業[kougyou] glorious achievement