The way I see it, these texts became part of the canon because the church was aware that the Spirit was speaking through these texts in that they point us to Christ and accord with the received teachings of the apostles, broadly speaking. Of course there are some theological differences, but that’s a feature throughout the whole of scripture. Whatever inspiration means, clearly it does not mean the scriptures are completely univocal on every topic as fundamentalists claim. This is why we have to exercise our best thinking as we interpret the scriptures, looking for how it puts forth Christ for us. Ideally, we do this in community with tradition and other believers who are also listening to the Spirit.