All at all points thou canst not meet,
Some will pass and some will pause.
What is true at last will tell:
Few at first will place thee well;
Some too low would have thee shine,
Some too high—no fault of thine—
Hold thine own, and work thy will!
You can't please everyone, whether you sing low, or loud or sweet. All you can do is sing your own song, in your own voice, as best you know how. Hold thine own, and work thy will!
meaning: manly, strong, grand, fertile
壮大 == soudai == (noun, adjective that takes な) magnificent, majestic, grand, splendid
Left radical is 'bed'. The right radical is 'male/samurai/erect penis' (士). The combination probably refers to male sexual virility. Henshall suggests as a mnemonic: 'Manly samurai in bed.'