And to know the love of Christ, which passeth knowledge, that ye might be filled with all the fulness of God.
God is indeed the WORD, and He has left for us HIS inspired written Word for our edification and ability to know HIM and His will for us.
In order to be filled with the fulness of OD and all that HE has in store for us, we must not neglect our reading of HIS WORD daily. It is the spiritual food which contains wisdom and truth and knowledge for us.
This is the best vitamin supplement we can possibly take. If GOD did not want us to take it, He would not have recorded HIS WORD for us over 600 years time and 30 authors. If we want to be filled with the Spirit, fill up in The Word!