Without controversy, the mystery of godliness is great: God was revealed in the flesh, Justified in the spirit, Seen by angels, Preached among the nations, Believed on in the world, And received up in glory.
Seen of angels ...  The implication here is that angels were extremely solicitous for our Lord's welfare, ever ready to do his will, and importantly identified with his earthly ministry.  Angels announced his birth, warned Joseph to flee into Egypt, ministered to him in the wilderness, strengthened him in Gethsemane, rolled away the stone from his grave, announced his resurrection, escorted him to glory and prophesied his return in the Second Advent.  Twelve legions of angels stood ready to rescue him during the Passion, and ten thousand of his holy angels will accompany him in the Second Coming.  Yes, he was seen of angels.