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.

3222. In addition to this, loves and the affections belonging to them are represented by means of flames, which are indescribably varied. Truths however are represented by means of lights and by means of countless modifications of light. From this it may be seen how it comes about that flames in the Word mean goods that are the goods of love, and lights truths that are the truths of faith.