These are marvellous words, quoted there from Isaiah 40, graphic words, a wonderful illustration of the way in which God deals with men. The original reference of Isaiah’s words was a message of hope to the captives in Babylon.
Some people just won’t trust God. They have been so godless for so long: the idea of turning to God and asking for mercy, pleading for forgiveness and yielding the life. They couldn't do that because they have been so self-sufficient and so carnal and so all out for this world for so long. They find it very hard to trust that there is a God and that God will deal with them. That would stop you ever being converted if God were not prepared even to help you through that.
Looking back to the hebrew of Isaiah, it's very interesting the way it is introduced. A voice: that is all. It comes over in a slightly more polished manner by the time it is quoted by John the Baptist. The prophet says the voice of one crying in the wilderness, a voice in a wilderness where people are not listening. The idea is that by and large people know nothing about the living God. By nature we are far from him. We do not understand how we may come to know him, what the position is between us and God, how God describes us and looks at us. It was a wilderness when John the Baptist came. Although the people were trained in the Old Testament about a holy God and human sin and the need of sacrifice and reconciliation with God, most people took very little attention. The land was a wilderness; there were not very many people with real faith in the Lord. So it is the voice of one, crying out in an appealing, urgent tone. That is a good description of the days in which we live? When we explain the gospel these days, the way of salvation, how to come to God or mighty God, we speak by and large to a nation that has lost all knowledge of these things. Any preacher in any town is a voice crying in a dry, barren place.