Jamieson, Fausset and Brown on Colossians 2:9

9. For--"Because." Their "philosophy" (Col 2:8) is not "after Christ," as all true philosophy is, everything which comes not from, and tends not to, Him, being a delusion; "For in Him (alone) dwelleth" as in a temple, &c.

the fulness--(Col 1:19; Joh 14:10).

of the Godhead--The Greek (theotes) means the ESSENCE and NATURE of the Godhead, not merely the divine perfections and attributes of Divinity (Greek, "theiotes"). He, as man, was not merely God-like, but in the fullest sense, God.

bodily--not merely as before His incarnation, but now "bodily in Him" as the incarnate word (Joh 1:14, 18). Believers, by union with Him, partake of His fulness of the divine nature (Joh 1:16; 2Pe 1:4; see on Ep 3:19).