1. Note the revelation of God's character, and of our consequent duty, which preceded the repetition of the covenant. 'I am the Almighty God.' The aspect of the divine nature, made prominent in each revelation of Himself, stands in close connection with the circumstances or mental state of the recipient. So when God appeared to Abram after the slaughter of the kings, He revealed Himself as 'thy Shield' with reference to the danger of renewed attack from the formidable powers which He had bearded and beaten. In the present case the stress is laid on God's omnipotence, which points to doubts whispering in Abram's heart, by reason of God's delay in fulfilling His word, and of his own advancing years and failing strength. Paul brings out the meaning of the revelation when he glorifies the faith which it kindled anew in Abram, 'being fully assured that, what He had promised, He was able also to perform' (Rom. iv. 21). Whenever our 'faith has fallen asleep' and we are ready to let go our hold of God's ideal and settle down on the low levels of the actual, or to be somewhat ashamed of our aspirations after what seems so slow of realisation, or to elevate prudent calculations of probability above the daring enthusiasms of Christian hope, the ancient word, that breathed itself into Abram's hushed heart, should speak new vigour into ours. 'I am the Almighty God--take My power into all thy calculations, and reckon certainties with it for the chief factor. The one impossibility is that any word of Mine should fail. The one imprudence is to doubt My word.' What follows in regard to our duty from that revelation? 'Walk before Me, and be thou perfect.' Enoch walked _with_ God; that is, his whole active life was passed in communion with Him. The idea conveyed by 'walking _before_ God' is not precisely the same. It is rather that of an active life, spent in continual consciousness of being 'naked and opened before the eyes of Him to whom we have to give account.' That thrilling consciousness will not paralyse nor terrify, if we feel that we are not only 'ever in the great Task-Master's eye,' but that God's omniscience is all-knowing love, and is brought closer to our hearts and clothed in gracious tenderness in Christ whose 'eyes were as a flame of fire,' but whose love is more ardent still, who knows us altogether, and pities and loves as perfectly as He knows.