21 But that ye also may know my affairs, and how I do, Tychicus, a beloved brother and faithful minister in the Lord, shall make known to you all things: 22 Whom I have sent unto you for the same purpose, that ye might know our affairs, and that he might comfort your hearts.
Tychicus is mentioned elsewhere and was an important help to Paul.
Acts 20:4 And there accompanied him into Asia Sopater of Berea; and of the Thessalonians, Aristarchus and Secundus; and Gaius of Derbe, and Timotheus; and of Asia, Tychicus and Trophimus.
Colossians 4:7 All my state shall Tychicus declare unto you, who is a beloved brother, and a faithful minister and fellowservant in the Lord:
Colossians 4:18 The salutation by the hand of me Paul. Remember my bonds. Grace be with you. Amen. « Written from Rome to Colossians by Tychicus and Onesimus. »
2Timothy 4:12 And Tychicus have I sent to Ephesus.
Titus 3:12 When I shall send Artemas unto thee, or Tychicus, be diligent to come unto me to Nicopolis: for I have determined there to winter.
He has been sent from Rome to deliver this letter to the church at Ephesus and to give them an account of how Paul was doing at Rome. It is because of that effort that we have this marvelous letter of Christian doctrine, not confusing, but clear and precise, on how we are supposed to live.
23 Peace be to the brethren, and love with faith, from God the Father and the Lord Jesus Christ. 24 Grace be with all them that love our Lord Jesus Christ in sincerity. Amen. « To the Ephesians written from Rome, by Tychicus. »
And so, this wonderful work on what it means to be a Christian ends. I ask you to read it again, doing your own cross referencing of verses. Pray that the Holy Spirit teaches you from it. Let God speak to you through His word every day.