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 Gehazi the servant of Elisha the man of God, said, "Behold, my master has spared this Naamanthe Syrian, in not receiving at his hands that which he brought. As Yahweh lives, I will run after him, and take something from him."