text: As far as explaining Primacy of Conscience you already know that you and I have different concepts of it.
  Inviting the couple to to delve into scriptural commentaries is exposing them to false interpretations as well as genuine ones. Human nature is such that the choice of interpretation is likely to be that which favours their desires.
  You did not say that they should be apprised first and foremost as to how the Church judges their situation.
  Presumably Jesus regarded marriages between Jews as being joined together by God, hence His words, "whom God has joined together, etc". St Paul was referring to gentile unions which he obviously didn't regard as 'joined by God', so he wasn't overriding Christ.