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56 For thy sister Sodom was not mentioned by thy mouth in the day of thy pride,
Walking represents living, and usually means living according to the true things taught to us by the Lord -- to "walk in His ways." When the Lord is pictured walking, it means life itself.
18 In that day I will make a covenant for them with the animals of the field, and with the birds of the sky, and with the creeping things of the ground. I will break the bow, the sword, and the battle out of the land, and will make them lie down safely.