In Acts 20:17-38, Paul passed the torch of ministry to the elders of the church in Ephesus. In his speech to them, Paul described the character of elders and their work of ministry. With a few such elders as Paul described, the church has the team it needs to fulfill the mission that God has given it.
The Thessalonian believers followed the good example of their faithful ministers.
From all of eternity God held a secret, which he finally revealed through his church to all the heavenly beings.
In some of his last words, in Matthew 28:16-20, Jesus gave a clear mission to his disciples: to make more disciples of all people...