'With twain he did fly.' That is the emblem of joyous, buoyant, unhindered motion. It is strongly, sadly contrary to the toilsome limitations of us heavy creatures who have no wings, but can at best run on His service, and often find it hard to 'walk with patience in the way that is set before us.' But--service with wings, or service with lame feet, it matters not. Whosoever, beholding God, has found need to hide his face from that Light even whilst he comes into the Light, and to veil his feet from the all-seeing Eye, will also feel impulses to go forth in His service. For the perfection of worship is neither the consciousness of my own insufficiency, nor the humble recognition of His glory, nor the great voice of praise that thrilled from those immortal lips, but it is the doing of His will in daily life. Some people say the service of man is the service of God. Yes, when it is service of man, done for God's sake, it is so, and only then. The old motto, 'Work is worship,' may preach a great truth or a most dangerous error. But there is no possibility of error or danger in maintaining this: that the climax and crown of all worship, whether for us footsore servants upon earth, or for these winged attendants on the throne of the King in the heavens, is activity in obedience. And that is what is set before us here. Now, dear brethren, we, as Christians, have a far higher motive for service than the seraphs had. We have been redeemed, and the spirit of the old Psalm should animate all our obedience: 'O Lord, truly I am Thy servant.' Why? The next clause tells us: 'Thou hast loosed my bonds.' The seraphs could not say that, and therefore our obedience, our activity in doing the will of the Father in heaven, should be more buoyant, more joyful, more swift, more unrestricted than even theirs. The seraphim were winged for service even while they stood above the throne and pealed forth their thunderous praise which shook the Temple. May we not discern in that a hint of the blessed blending of two modes of worship which will be perfectly united in heaven, and which we should aim at harmonising even on earth? 'His servants serve Him and see His face.' There is possible, even on earth, some foretaste of the perfection of that heavenly state in which no worship in service shall interfere with the worship in contemplation. Mary, sitting at Christ's feet, and Martha, busy in providing for His comfort, may be, to a large extent, united in us even here, and will be perfectly so hereafter, when the practical and the contemplative, the worship of noble aspiration, of heart-filling gazing, and that of active service shall be indissolubly blended.