To approach the unavoidable figure of Paul both a biographic knowledge and an understanding of his world are obligatory ventures.
Even if Paul was not the first one to use the form letters as a means for communication in the ancient world, he used this method in an unprecedented way. The letters sent by Paul to the different early Christian communities had a multiple purpose: announcing the mysteries of faith; greeting and maintaining contact; exchanging news; announcing projects; addressing some questions dealing with practical matters; correcting some behaviors, and even recommending persons.
Nowadays, as in the past, language matters. Reading and studying accurately Paul shall enable the building up and animating Christian communities.