My dear parishioners,
Peace! Under headings of Judgment, Formation, Choice in Accord, Erroneous Judgment and In Brief, the Catechism of the Catholic Church addresses “conscience” in twenty-nine passages. Here we consider CCC, 1792.
There are at least seven various sources of errors of judgment in our moral conduct.
Ignorance of Christ and His Gospel can be a source of error of judgment in our moral conduct. While there have been “virtuous pagans” (Aristotle comes to mind) who know and adhere to the Natural Law, often apart from the light which comes from Christ and His Gospel (cf. John 8:12; Matthew 5:14) we forget in whose image we are made and by whose blood we have been redeemed.
The bad example given by others can be a source of error of judgment in our moral conduct. How many times have we heard “everyone is doing it”? Sacred Scripture happily has a remedy for such fallacious thinking: “You shall not follow a multitude to do evil” (Exodus 23:2). The argumentum ad populum fallacy is also called the “herd/mob mentality.”
Enslavement to our passions can be a source of error of judgment in our moral conduct. Saint Thomas Aquinas, OP (+1274) treats the various passions in his Summa Theologiae I-II Q. 22-48. The passions are sometimes better known, less accurately, as emotions, and include joy, sorrow, love, hatred, daring fear, hope… Virtue, on the other hand subdues the passions and orders them according to reason.
A mistaken notion of the autonomy of conscience can be a source of error of judgment in our moral conduct. While no citations are given here in the Catechism to Gaudium et spes, articles 3, 8, 16, 19, 26, 31, 36, 41, 76, 79, 87, are all relevant in addressing both autonomy and conscience. One common mistaken view of autonomy is that “no one can tell me what to do…” God has told us and continues to tell us to do good and to avoid evil, that certain things are good and certain other things are evil (recall the Commandments, the Beatitudes…).
Rejection of the Church’s authority and her teaching can be a source of error of judgment in our moral conduct. Saint John XXIII (+1963) reminds us that the Church is both Mother and Teacher (Mater et Magistra) (15 May, 1961). Dissent has been a cancer plaguing the Church and disregarding Lumen Gentium 25, at least since 24 July, 1968, when Blessed Paul VI (+1978) published Humanae vitae.
Lack of conversion can be a source of error of judgment in our moral conduct. If we love our sins and vices more than God, His grace and call to holiness we are not in conversion.
Lack of charity can be a source of error of judgment in our moral conduct. God calls us to love Him above all and our neighbor and self accordingly (cf. Matthew 22:37). When we sin we show a lack of love (charity) toward God, neighbor and self.

God bless you!
Father John Arthur Orr