All my state shall Tychicus declare unto you - See these verses explained in the notes at Ephesians 6:21-22.
Related Commentaries of Colossians 4:7
Colossians 4:7-8
7 All my state shall Tychicus declare unto you, who is a beloved brother, and a faithful minister and fellowservant in the Lord:
8 Whom I have sent unto you for the same purpose, that he might know your estate, and comfort your hearts;