[2:1] For I want you to know how great a struggle I have for you and for those at Laodicea and for all who have not seen me face to face,  that their hearts may be encouraged, being knit together in love, to reach all the riches of full assurance of understanding and the knowledge of God's mystery, which is Christ,  in whom are hidden all the treasures of wisdom and knowledge.  I say this in order that no one may delude you with plausible arguments.  For though I am absent in body, yet I am with you in spirit, rejoicing to see your good order and the firmness of your faith in Christ.
(Colossians 2:1-5 ESV)
Without Scripture(that is, true writings from God about God), how are we to reach all the riches of full assurance of understanding and the knowledge of God's mystery, which is Christ? In other words, how do we know God, without being able to know Him, to Study Him? I'm not insinuating that reading the Scripture is like looking at the face of Christ, rather, I am saying that the Study of Scripture is how we find out about Him, both what He commands and what He has done. It's akin to me getting out some of my grandfather's letters to my grandmother to try and get a better picture of what he was like. Only in the case of the Scriptures, we are dealing with the Living God, and not studying someone else's relationship, but studying our own. What am I to do with this Person Jesus Christ? How am I to know Him?