text: So from another perspective, taking into account the full Gospel testimony and the realities of human interactions in spousal relationships it is possible to interpret the words of Jesus in another light, apart from church teaching, so-called, where the ideal is given to those who receive it, but not everyone is able to and other options present themselves, celibacy, for example. The purpose of the teaching then is to illustrate how the Kingdom of God is worth the ultimate sacrifice. 
         I am not thinking of myself, but the many people who do not live up to this standard who by the working of grace  may still receive mercy from God. Blessed are the merciful. 
        As for heresy, any call to uncritical obedience to the Pope without recourse to conscience is against church teaching. St. Thomas vs. Peter Lombard: "Hic magister falsum dicit". "Here, the Master (Lombard) is wrong". Lombard taught one must subjugate conscience to church teaching.