The Spirit and the Word
A walk in the Spirit will of necessity be a walk in accordance with the Word the Spirit has inspired. The parallel between Eph. 5:18-21 and Col. 3:15-17 is significant. The same results are said to flow from being filled with the Spirit in the first case, and being filled with the Word in the second.
To remain filled with the Spirit, and thus enjoy His continuing sanctifying work, will mean continuing to be filled with the Word. The relationship is obvious.