Colossians 1-4, First Thessalonians 1-5, Second Thessalonians 1-3

The seventh letter from, the Letter to the Colossians, features a reference to Timothy right from the start.  It explains what exactly Jesus represented, warns about falling for dissenting beliefs.  Perhaps the biggest news out of this letter also explains something from Acts.  Remember how Paul and Barnabas had a falling out over Mark?  According to this letter, Barnabas had a good reason to side with Mark, because the possible gospel writer was in fact his cousin.  Another probably gospel (and Acts) writer, Luke is referenced, as "the beloved physician."  Considering how often Paul is described as getting banged up in Acts, he could certainly use one of those.  The letter concludes with a message to pass it along.  And passed along it has been.

First Letter of Paul to the Thessalonians references Timothy right away.  These Thessalonians are also excellent examples of the faith.  Paul references his rough treatment in Philippi, which otherwise didn't deter him there, because that's the other community to get a happy letter from him.

Second Letter of Paul to the Thessalonians also references Timothy immediately (it should be noted that when this happens, it means Paul has included him in the opening address, so these letters can be said to be coming from both of them).  Paul is still very pleased with the Thessalonians.  He likes them so much he uses them as an example to other communities (and thanks to this letter's presence in the New Testament, keeps on doing it).  Both letters speak of the second coming, which is an event preceded by the Antichrist.  You can take that literally or interpret it to indicate the persecution from the Roman Empire, which certainly got pretty nasty.