Hans Kung is a formidable theologian and for the longest time, since Vatican II, has been a respectable resource of many students of theology. Wa ta kahibaw basin naa ni siyay kslihotgot nganong wa mahimong obispo kay ang iyang contemporary nga si Ratzinger nahimo mang obispo... eventually a cardinal, then a pope, hehehe
If I may forward my assumption, his inability to take charge further than a diocesan priest, not as a bishop, or a cardinal, is because of his liberal and heretical teachings towards the Roman Catholic Church. This is the very reason why he was not permitted to teach Theology because he intertwines his own personal agenda and biases. He was removed from teaching theology because of his heretical views.
Let us go back and define the two forms of heresy, shall we?
The Catechism of the Catholic Church defines these three sins against the faith in this way:
2089 Incredulity is the neglect of revealed truth or the willful refusal to assent to it.
Heresy is the obstinate post-baptismal denial of some truth which must be believed with divine and catholic faith, or it is likewise an obstinate doubt concerning the same;
apotasy is the total repudiation of the Christian faith;
schism is the refusal of submission to the Roman Pontiff or of communion with the members of the Church subject to him." [Code of Canon Law c.751]
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