He was consultor to the late Cardinal Julio Rosales in the Pontifical Commission for the Revision of the Code of Canon Law, to the Papal Nuncio to the Philippines, Archbishop Bruno Torpiglani, and to Cardinal Jaime Sin, who appointed him delegate to the 1979 Synod of Manila, as expert in social ethics.
He received criticism for this from Manila Archbishop Jaime Sin, who called him an "agent of Satan" for distributing condoms against the Catholic Church's prohibition of condoms.
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