[MrChips]

No. Even in pre-Conciliar versions, Conscience was the most important teaching in the Catechism: it is that through which God speaks to you.

[ebb tide]

Conscience was the most important teaching in the Catechism: it is that through which God speaks to you.

Source please. Name the catechism and the edition.

If "conscience was the most important teaching", why did God give Moses the Ten Commandments? One of which is, "Thou shallt not kill".

Every human has a conscience, including Jeffery Dahmer, John Wayne Gacy, etc. Was God "speaking" to them, Mr. Chips?

[Unam Sanctam]

One has a duty to inform one’s conscience by the teachings of the Faith.

[ebb tide]

From the Catechism of Pope St. Pius X:

27 Q. Which is the noblest creature God has placed on earth? 
A. The noblest creature God has placed on earth is man.

28 Q. What is man? 
A. Man is a rational creature composed of soul and body.

29 Q. What is the soul?
A. The soul is the noblest part of man, because it is a spiritual substance, endowed with intelligence and will, capable of knowing God and of possessing Him for all eternity.

Having claiming to have taught Latin for 23 years, I would think you know the root word of "conscience" is scio which means "I know".