John Bergsma at The Sacred Page has a brilliant post in which he accurately describes the relationship between Christ and the Pharisees in regard to their teachings:
Finally, let us reflect for a moment on the fact that, in the Sermon on the Mount, Our Lord consistently raised the moral requirements of true discipleship vis-à-vis the Pharisees and contemporary Jewish practice, rather than lowering them.
The idea—which seems to be widespread—that Jesus’ morally teaching was somehow less demanding or more relaxed than that of the Pharisees is quite incorrect. It is true that Jesus did not endorse the plethora of ritual washings and other purity regulations practiced by the Pharisees, but on matters of moral law he was more, not less, stringent.
Go here to read the rest. Catholicism is a historical faith, and it is badly distorted when knaves, taking advantage of the wide- spread historical ignorance today, misuse history to win current battles by appealing to fools who do not know the history. Those Catholics who are against the Church extending communion to those living in adulterous second marriages are not being Pharisees. They are attempting to uphold the teaching of He who stood against the Pharisees when they exalted human needs above divine commandments.