There was some controversy surrounding this man when he was about to be raised to the cardinalate. He made some pro-homosexual, pro-contraception comments and maybe some other dissenting comments. Because of this, he was made to make this profession of faith which specifically included an oath to uphold the Church teaching on the immorality of the homosexual act. Apparently he has not been faithful to this oath:
scmo.org.uk/_titles/view.asp?id=173
2. Further Profession of Faith of Cardinal Designate Keith Patrick O’Brien, Archbishop of St Andrews and Edinburgh, made in St Mary’s Cathedral Edinburgh on Tuesday 7th October 2003.
Furthermore, I having been called to be Cardinal by pope John Paul II, state that I firmly hold and maintain all and everything taught by the Holy Catholic Church concerning faith and morals, whether solemnly defined or asserted as part of her ordinary Magisterium, especially those doctrines touching the mystery of the Church as the Body of Christ, the Sacraments, the sacrifice of the Mass and the primacy of the Roman Pontiff.
I further state that I accept and intend to defend the law on ecclesiastical celibacy as it is proposed by the Magisterium of the Catholic Church; I accept and promise to defend the ecclesiastical teaching about the immorality of the homosexual act; I accept and promise to promulgate always and everywhere what the Church’s Magisterium teaches on contraception. So help me God and these Holy Scriptures which I touch with my hand.