Charles H. Spurgeon on Psalms 77:20

Thou leddest thy people like a flock, etc. From this verse the afflicted may learn many consolations. First, that the best people that be are no better able to resist temptation, than the simple sheep is able to withstand the brier that catcheth him. The next, that man is of no more ability to beware of temptations, than the poor sheep is to avoid the brier, being preserved only by the diligence of the shepherd. The third, that as the shepherd is careful of his entangled and briard sheep, so is God of his afflicted faithful. And the fourth is, that the people of Israel could take no harm of the water, because they entered the sea at God's commandment. Whereof we learn, that no danger can hurt when God doth command us to enter into it; and all dangers overcome us if we choose them ourselves, besides God's commandment; as Peter, when he went at God's commandment upon the water, took no hurt; but when he entered into the bishop's house upon his own presumption, was overcome and denied Christ. The Israelites, when they fought at God's commandment, the peril was nothing; but when they would do it of their own heads, they perished: so that we are bound to attend upon God's commandment, and then no danger shall destroy us, though it pain us. The other doctrine is in this, that God used the ministry of Moses and Aaron in the deliverance of his people, who did command them to do nothing but that the Lord did first bid. Whereof we learn that such as be ministers appointed of God, and do nothing but as God commandeth, are to be followed; as Paul saith, "Follow me, as I follow Christ." John Hooper.