Paul ends with a blessing from God.
Paul uses this word here to mark a change in topic.
The words "our" and "us" refer to all believers. (See: rc://en/ta/man/translate/figs-inclusive)
Here "himself" gives additional emphasis to the phrase "Lord Jesus Christ." (See: rc://en/ta/man/translate/figs-rpronouns)
"hearts" refers to the seat of emotions. AT: "comfort you and strengthen you for" (See: rc://en/ta/man/translate/figs-metonymy)
"Word" here is a metonym for "message." AT: "every good thing you say and do." (See: rc://en/ta/man/translate/figs-metonymy)