Makes one wonder what the point of a Church is if just about everything, even whether one really got married and needs to stick to their vows before God, is up to personal conscience.
The job of the Church is to lead the flock to God. The conscience places a large part in doing that. From the Catechism:
CHAPTER ONE
THE DIGNITY OF THE HUMAN PERSON
ARTICLE 6
MORAL CONSCIENCE
1776 “Deep within his conscience man discovers a law which he has not laid upon himself but which he must obey. Its voice, ever calling him to love and to do what is good and to avoid evil, sounds in his heart at the right moment. . . . For man has in his heart a law inscribed by God. . . . His conscience is man’s most secret core and his sanctuary. There he is alone with God whose voice echoes in his depths.” (GS 16.)
I. THE JUDGMENT OF CONSCIENCE
1777 Moral conscience,(Cf. Rom 2:14-16.) present at the heart of the person, enjoins him at the appropriate moment to do good and to avoid evil. It also judges particular choices, approving those that are good and denouncing those that are evil. (Cf. Rom 1:32.) It bears witness to the authority of truth in reference to the supreme Good to which the human person is drawn, and it welcomes the commandments. When he listens to his conscience, the prudent man can hear God speaking.
1778 Conscience is a judgment of reason whereby the human person recognizes the moral quality of a concrete act that he is going to perform, is in the process of performing, or has already completed. In all he says and does, man is obliged to follow faithfully what he knows to be just and right. It is by the judgment of his conscience that man perceives and recognizes the prescriptions of the divine law:
Conscience is a law of the mind; yet [Christians] would not grant that it is nothing more; I mean that it was not a dictate, nor conveyed the notion of responsibility, of duty, of a threat and a promise. . . . [Conscience] is a messenger of him, who, both in nature and in grace, speaks to us behind a veil, and teaches and rules us by his representatives. Conscience is the aboriginal Vicar of Christ. (John Henry Cardinal Newman, “Letter to the Duke of Norfolk,” V, in Certain Difficulties felt by Anglicans in Catholic Teaching II (London: Longmans Green, 1885), 248.)
1779 It is important for every person to be sufficiently present to himself in order to hear and follow the voice of his conscience. This requirement of interiority is all the more necessary as life often distracts us from any reflection, self-examination or introspection:
Return to your conscience, question it. . . . Turn inward, brethren, and in everything you do, see God as your witness.(St. Augustine, In ep Jo. 8,9
L 35,2041.)
1780 The dignity of the human person implies and requires uprightness of moral conscience. Conscience includes the perception of the principles of morality (synderesis); their application in the given circumstances by practical discernment of reasons and goods; and finally judgment about concrete acts yet to be performed or already performed. The truth about the moral good, stated in the law of reason, is recognized practically and concretely by the prudent judgment of conscience. We call that man prudent who chooses in conformity with this judgment.
1781 Conscience enables one to assume responsibility for the acts performed. If man commits evil, the just judgment of conscience can remain within him as the witness to the universal truth of the good, at the same time as the evil of his particular choice. The verdict of the judgment of conscience remains a pledge of hope and mercy. In attesting to the fault committed, it calls to mind the forgiveness that must be asked, the good that must still be practiced, and the virtue that must be constantly cultivated with the grace of God:
We shall . . . reassure our hearts before him whenever our hearts condemn us; for God is greater than our hearts, and he knows everything.(1 Jn 3:19-20)
1782 Man has the right to act in conscience and in freedom so as personally to make moral decisions. “He must not be forced to act contrary to his conscience. Nor must he be prevented from acting according to his conscience, especially in religious matters.” (DH 3 § 2)
There is a lot more here:
vatican.va/archive/ccc_css/archive/catechism/p3s1c1a6.htm
