Youcat commented through CCC - Question n. 67 - Part I.

YOUCAT Question n. 67 - Part I.  What is sin?

(Youcat answer) At the core of sin is a rejection of God and the refusal to accept his love. This is manifested in a disregard for his commandments.     

A deepening through CCC

(CCC 1849) Sin is an offense against reason, truth, and right conscience; it is failure in genuine love for God and neighbor caused by a perverse attachment to certain goods. It wounds the nature of man and injures human solidarity. It has been defined as "an utterance, a deed, or a desire contrary to the eternal law" (St. Augustine, Contra Faustum 22: PL 42, 418; St. Thomas Aquinas, STh I-II, 71, 6).       

Reflecting and meditating 

(Youcat comment) Sin is more than incorrect behavior; it is not just a psychological weakness. In the deepest sense every rejection or destruction of something good is the rejection of good in itself, the rejection of God. In its most profound and terrible dimension, sin is separation from God and, thus, separation from the source of life. That is why death is another consequence of sin. Only through Jesus do we understand the abysmal dimension of sin: Jesus suffered God’s rejection in his own flesh. He took upon himself the deadly power of sin so that it would not strike us. The term that we use for this is redemption.    

(CCC Comment)

(CCC 1850) Sin is an offense against God: "Against you, you alone, have I sinned, and done that which is evil in your sight" (Ps 51:4). Sin sets itself against God's love for us and turns our hearts away from it. Like the first sin, it is disobedience, a revolt against God through the will to become "like gods" (Gen 3:5), knowing and determining good and evil. Sin is thus "love of oneself even to contempt of God" (St. Augustine, De civ. Dei 14, 28: PL 41, 436). In this proud self-exaltation, sin is diametrically opposed to the obedience of Jesus, which achieves our salvation (cf. Phil 2:6-9).     

(This question:  What is sin? is continued)