Titus 1:1 says, Paul, a servant of God, and an apostle of Jesus Christ, according to the faith of God's elect, and the acknowledging of the truth which is after godliness; As with many of his letters, Paul first identifies himself as an apostle of Jesus Christ according to God's call to him. He also said that he acknowledged the truth of God since all truth comes from God. He said this then led him to Godliness, which comes from obedience to God's word. Though we might not be called to be an apostle in the sense that it was understood in Paul's day, we are all called to a specific purpose in doing God's work today and to the general calling of calling all people to come to Jesus Christ for salvation, so we too should acknowledge the truth of God by faith.
Verse two adds, In hope of eternal life, which God, that cannot lie, promised before the world began; Paul said he did this not for earthly rewards but for the hope of eternal life with God which He promised to those who put their faith in Him before the world began. Jesus Christ dying on the cross for the sins of mankind was not a plan developed after mankind sinned but was God's plan from the beginning if they did sin. Still, had people not sinned, this would not have been necessary. People always have free-will, and they always choose to sin, except for one Man, Jesus Christ.
Verse three continues, But hath in due times manifested his word through preaching, which is committed unto me according to the commandment of God our Saviour; Paul said that in due time God manifested this truth through preaching and he was called to preach according to God's commandment to him. God still manifests His word to people today through preachers who are called by Him to preach, but also through His written word, the Bible, and through all Christians reaching out to others with the call to salvation. God's truth should also be manifested by the way that we as followers of Christ live our lives every day.
Verse four concludes, To Titus, mine own son after the common faith: Grace, mercy, and peace, from God the Father and the Lord Jesus Christ our Saviour. Paul said this was written to Titus, his son after the common faith. As with Timothy, Paul may have felt like he was a spiritual father to Titus, but he really was a brother instead. There is but one heavenly Father, and that is God himself. Paul asked that God give Titus His grace, mercy, and peace which can only come by putting our faith in Jesus Christ. We can only have spiritual peace by the grace of God Who sent His only begotten Son Jesus Chrit to die for our sins.