These two verses constitute a prayer, a petition made to God by Paul on behalf of the Thessalonians. The first verse of the prayer is an identification of God. The second verse of the prayer is the petition made.
Regarding the identification made, it is interesting that Jesus Christ is first mentioned, then the Father. Nothing else should be ascertained about this, other than the fact that the Father and the Son are so unified in their work and desires (cf. John 17) that there is no great significance in their order or appearance.
Regardless, God loves us, and by His Son He saved us, giving us consolation and hope by the extension of His grace.
Now about the petition. It was Paul’s desire that God comfort them. In other words, that the same consolation and hope would continue, and work in them. Paul desired that God would establish them (in every good word and work, cf. Ephesians 2:10). They would be persecuted and harmed from without and within. With God’s help their faith would not waver.
