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You really need to stop posting, Drew.  You do nothing but embarrass yourself more with each post.

So St. Thomas was a heretic for not believing in the dogma of the Immaculate Conception?  After all, it has always been dogma.  So if dogma is the rule of faith, then he was a heretic, right?

I assume that you would respond that it's because the dogma was not yet proximate to him, right?  At the time, that particular dogma was not the proximate rule of faith for him.

You have turned into a complete moron. Yuk.
 
Yes, it has always been a dogma.

As Pope Pius IX puts it:

The Catholic Church, directed by the Holy Spirit of God, is the pillar and base of truth and has ever held as divinely revealed and as contained in the deposit of heavenly revelation this doctrine concerning the original innocence of the august Virgin — a doctrine which is so perfectly in harmony with her wonderful sanctity and preeminent dignity as Mother of God — and thus has never ceased to explain, to teach and to foster this doctrine age after age in many ways and by solemn acts........


And indeed, illustrious docuмents of venerable antiquity, of both the Eastern and the Western Church, very forcibly testify that this doctrine of the Immaculate Conception of the most Blessed Virgin, which was daily more and more splendidly explained, stated and confirmed by the highest authority, teaching, zeal, knowledge, and wisdom of the Church, and which was disseminated among all peoples and nations of the Catholic world in a marvelous manner — this doctrine always existed in the Church as a doctrine that has been received from our ancestors, and that has been stamped with the character of revealed doctrine. For the Church of Christ, watchful guardian that she is, and defender of the dogmas deposited with her, never changes anything, never diminishes anything, never adds anything to them; but with all diligence she treats the ancient docuмents faithfully and wisely; if they really are of ancient origin and if the faith of the Fathers has transmitted them, she strives to investigate and explain them in such a way that the ancient dogmas of heavenly doctrine will be made evident and clear, but will retain their full, integral, and proper nature, and will grown only within their own genus — that is, within the same dogma, in the same sense and the same meaning. -  Pope BI. Pius IX, Ineffabilis Deus

You have turned into a complete moron. Yuk.
 
Yes, it has always been a dogma.

As Pope Pius IX puts it:

The Catholic Church, directed by the Holy Spirit of God, is the pillar and base of truth and has ever held as divinely revealed and as contained in the deposit of heavenly revelation this doctrine concerning the original innocence of the august Virgin — a doctrine which is so perfectly in harmony with her wonderful sanctity and preeminent dignity as Mother of God — and thus has never ceased to explain, to teach and to foster this doctrine age after age in many ways and by solemn acts........


And indeed, illustrious docuмents of venerable antiquity, of both the Eastern and the Western Church, very forcibly testify that this doctrine of the Immaculate Conception of the most Blessed Virgin, which was daily more and more splendidly explained, stated and confirmed by the highest authority, teaching, zeal, knowledge, and wisdom of the Church, and which was disseminated among all peoples and nations of the Catholic world in a marvelous manner — this doctrine always existed in the Church as a doctrine that has been received from our ancestors, and that has been stamped with the character of revealed doctrine. For the Church of Christ, watchful guardian that she is, and defender of the dogmas deposited with her, never changes anything, never diminishes anything, never adds anything to them; but with all diligence she treats the ancient docuмents faithfully and wisely; if they really are of ancient origin and if the faith of the Fathers has transmitted them, she strives to investigate and explain them in such a way that the ancient dogmas of heavenly doctrine will be made evident and clear, but will retain their full, integral, and proper nature, and will grown only within their own genus — that is, within the same dogma, in the same sense and the same meaning. -  Pope BI. Pius IX, Ineffabilis Deus

He said it's always been a dogma you blithering idiot. That was exactly his point. It has always been a dogma and yet St. Thomas was not a heretic for not believing it. Because it had not yet been defined in the infallible Magisterium. But now that it has been, any Catholic who denies it would be a heretic. 

Ergo, Magisterium is the rule of faith, as it is your adherence to the Magisterium that decides whether you are a heretic or not, as proven by Ladislaus' example of St. Thomas.