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.
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But I will remove far from you the northern army, and will drive him into a land barren and desolate, with his face towards the eastsea, and his hinder part towards the utmost sea, and his odious scent shall come up, and his ill savor shall come up, because he hath done great things.