"By day the LORD went ahead of them in a pillar of cloud to guide their way, and by night in a pillar of fire to give them light." (Exodus 13:21)
After the tenth plague, every firstborn in Israel is consecrated to the LORD: in the future when your son asks you what this means, tell him about what the LORD did for us when we came out of Egypt. The redemption of the firstborn son is the ongoing commemoration of the night when God passed over the Israelite houses and struck the Egyptian firstborn. The Catechism sees in this consecration of the firstborn a foreshadowing of the consecration of Christ, the eternal firstborn Son, who is the fulfilment of every Israelite firstborn redeemed at the Exodus (CCC 529).
God leads the people the longer way through the desert rather than the shorter coastal route, because if they face war they might change their minds and return to Egypt. Moses takes the bones of Joseph with him, as Joseph had made the Israelites swear to do. They leave Egypt. By day the LORD went ahead of them in a pillar of cloud to guide their way, and by night in a pillar of fire to give them light, so that they could travel by day or night. Neither the cloud nor the pillar of fire left its place in front of the people. God does not lead from behind. He goes ahead. The presence that guided is the same presence that guards: day and night, movement and rest, every direction of the journey.
Brothers and sisters, the pillar of cloud by day and fire by night is the visible presence of God with his people on the road. The Church receives Christ's continued guidance through the Scripture, the sacraments, and the living Tradition: the pillar of his presence that does not leave its place in front of his people. However dark or unfamiliar the terrain, the cloud has not moved. Follow it.
Lord God, you went ahead of your people in a pillar of cloud and fire that never left them. Go ahead of us. Guide us in the longer way that avoids the battles we are not yet ready for. And let your presence be as visible to us as the pillar was to Israel, day and night. Through Christ our Lord. Amen.