The following quotes help us to see how the church has always upheld the primacy of conscience even if at times this teaching was a well kept secret.
"He who acts against his conscience loses his soul." (Fourth Lateran council, 1215)
"It is better to perish in excommunication than to violate one's conscience." (St. Thomas Aquinas)
"I shall drink . . To Conscience first, and to the Pope afterwards." (Cardinal John Henry Newman)
"If Newman places conscience above authority, he is not proclaiming anything new with respect to the constant teaching of the Church." (Pope John Paul II)
"In the final analysis, conscience is inviolable and no person is to be forced to act in a manner contrary to his/her conscience, as the moral tradition of the Church attests." (Human Life in Our Day, U.S. Bishops Pastoral)
"A human being must always follow the certain judgment of his conscience. If he were to deliberately act against it he would condemn himself." Catechism of the Catholic Church #1790)
"We follow church leaders only to the extent that they themselves follow Christ. . . Some situations oblige one to obey God and one's own conscience rather than the leaders of the church. Indeed, one may even be obliged to accept excommunication rather than act against one's own conscience." (Cardinal Walter Kasper, Head of Ecumenical Matters at the Vatican.)