A voice cries out: "In the wilderness prepare the way of Yahweh, make straight in the desert a highway for our God. Every valley shall be lifted up, and every mountain and hill be made low; the uneven ground shall become level, and the rough places a plain. And the glory of Yahweh shall be revealed, and all flesh shall see it together, for the mouth of Yahweh has spoken." A voice says, "Cry!" And I said, "What shall I cry?" All flesh is grass, and all its beauty is like the flower of the field. The grass withers, the flower fades, when the breath of Yahweh blows upon it; surely the people is grass. The grass withers, the flower fades; but the word of our God will stand for ever. Get you up to a high mountain, herald of good tidings; lift up your voice with strength, herald of good tidings, lift it up, fear not; say, "Behold your God!" Behold, here comes Yahweh GOD coming in power, coming to rule with powerful arm." (Isaiah chapter 40 verse 3)
"And I will lead the blind in a way that they know not, in paths that they have not known I will guide them. I will turn the darkness before them into light, the rough places into level ground. These are the things I will do, and I will not forsake them." (Isaiah chapter 42 verse 16)