This is an invitation into His Kingdom which leads to eternal life, but it’s not the most inviting invitation. We can walk into a great number of churches and listen to a great number of preachers on any given Sunday, and we will be given a much more welcoming invitation into the Kingdom of God than what Jesus offers us here.
Who am I to ever make a judgement on what type of people are fit or unfit to receive the gospel and the inheritance of the Holy Spirit? With deep roots as God's chosen people, I can understand why the Jewish people wrestled a little bit with the initial inclusion of the Gentiles, but it was made clear that God will show mercy to whomever He decides to show mercy - Jew or Gentile. Therefore, we are to preach without any prejudice.
The command to share and spread the gospel is clear, but perhaps sometimes we get confused as to what specifics regarding the gospel we need to make sure we're communicating. I am grateful that Peter, here, gives us two very specific things about our Lord and His message that we must share when communicating the gospel to others.
The apostle Paul served as a model to Titus as he showed him what it's like to be a servant of God, and he served as a mentor to Titus as he taught him God's Word through his authority as an apostle. This is the nature of the discipleship relationship - a model and mentor who teaches someone how to be a model and mentor for someone else. If we as followers of Jesus are devoting our lives to actually being disciples of Jesus then we will more than likely find ourselves with a mentor (one who teaches us) and disciples (those whom we teach). An absence of either of these types of relationships will significantly hinder our spiritual growth and rob us of the riches of spiritual maturity