Are Paul's Epistles Inspired By God

Can two people speak contrary to each to other and each speak the truth? Can anyone speak contrary to YHVH and still speak truth? Paul was a self-proclaimed Pharisee and Jesus told us to be cautious of the teachings (doctrines) of the Pharisee. Why? Jesus also told us that they were 'lawless hypocrites'. And Paul himself was often accused of being a liar. Can we trust what he said? In the same book that has Paul's epistles, we also find the words of YHVH's anointed Prophet (Messiah). If we compare their words it will be evident if Paul spoke truth, or error.