Although the epistles are unambiguous about the expectation of a second coming as a doctrine, it is rather ambiguous in the synoptic gospels. Jesus refers to the Son of Man in the third person, as if it wasn't him. In other words, it seems as if the New Testament wove together different strands of interpretation of who Jesus was and when. Indeed, in Matthew he comes across as nothing more than a Jewish holy man. And he doesn't address accomplishing any of the traditional Jewish expectations of the arrival of the messiah at that time. Even in the gospel of John, it is not exactly clear what a second coming is supposed to be, i.e. in John chapter 14. So in a way it seems that the creators of the New Testament wove together different views, 1) Synoptic gospels; 2) Gospel of John; 3) Epistles; 4) Revelation. But universal Christian doctrine assumes a second coming, as if it were unambiguously established in a single image in the texts, but it isn't true.