A. The shepherd himself
He knows he's being watched (just prior to v. 1)
He knows he shares (presently) a future glory (v. 1)
He knows he works for Another (v. 4)
B. The shepherd's oversight
Not begrudgingly, but with an eager heart (v. 2)
Not selfishly, but with selfless motivation (v. 2)
Not domineering, but with visible example (v. 3)