The connotation of "filled" here is "be being filled." That is, the filling with the Spirit is not a once-for-all experience, like the baptism of the Spirit into the body of Christ. Instead, we are urged to continually be filled with the Spirit--controlled by the Spirit. In a way analogous to how alcohol may control a person's thoughts and actions, the better way is to allow the Holy Spirit to have control. The word "filled" is the same as "fulfilled."

Source:

KJV Defenders Study Bible, by Dr. Henry Morris, Ph.D.
Publisher: Thomas Nelson
Language: English
DEF 10 ISBN 0-529-10444-x
DEF 10-1 ISBN 0-529-10445-8