In Job 40:15, the behemoth signifies the natural man as to the goods called delights of natural love. (Apocalypse Explained 455[18])

"Behemoth" has the same meaning as "beast" in the Word, namely, the natural affections that belong to man. Therefore it is said, "behold, the Behemoth, which I have made with thee." His spiritual pasture is true knowledge; this is meant by "he eats grass like an ox." (Apocalypse Explained 507)

(References: Apocalypse Explained 455)

The Lord, in the simplest terms, is love itself expressed as wisdom itself. In philosophic terms, love is the Lord's substance and wisdom is His form. Of course, we feel the Lord's love and hear His wisdom in many different ways, depending on our state in life and how receptive we are. That's why the Lord has so many different names in the Bible, and is referred to in so many different ways.