Pride and shame.

"Pride is not the opposite of shame, but its source.  Humility is the only antidote to shame."
.
The sin of pride is an inordinate desire or love of one's own excellence.  Through pride a man thinks himself better than he is or he thinks he can do things which are beyond his own power.  The proud man thinks all of his talents are his own, he will not even acknowledge that he owes them to God.  If he does concede they come form God, he he still thinks they are due to his own merit.  He boasts of gifts which he does not possess, while despising other men and imagining himself to be unique.  Pride is a serious sin because it leads man to resist even God himself, not to mention God's plan for humanity.  Pride and presumption calls vice virtue.
.
The original sin of our first parents was a sin of pride.  Through pride, through a disordered desire to attain some spiritual perfection without God, they fell.  (Paraphrased from My Way of Life, Confraternity of the Precious Blood)
.
Original sin is the source of disorder in man's soul.
.
Shame is good.
.
When we do something wrong and we are exposed as doing so, we become ashamed.  Shame, or guilt is a necessary realization or understanding of wrong doing.  Modesty, or sexual shame protects us from sin - it is a safeguard against sin.  Shame is the result of original sin.  The ordinary man knows instinctively that moral shame is a consequence of sin, as is sexual shame.  Sexual shame is in fact a positive shame in so far as it is the guardian and protector of purity and chastity.   To construct a perfect definition here is beyond my 'pay grade' but it is something Blessed John Paul II discusses at length in his Theology of the Body.
.
"(T)he mutual shame of the man and the woman as a symptom of the fall..." - JPII
.
A certain fear always belongs to the essence of shame. Nevertheless, original shame reveals its character in a particular way: "I was afraid, because I was naked." We realize that something deeper than physical shame, bound up with a recent consciousness of his own nakedness, is in action here. Man tries to cover the real origin of fear with the shame of his own nakedness. Thus he indicates its effect, in order not to call its cause by name. Then God-Yahweh says in his turn: "Who told you that you were naked? Have you eaten of the tree of which I commanded you not to eat?" (Gn 3:11).
.
Man alienated from love

.
2. The precision of that dialogue is overwhelming; the precision of the whole narrative is overwhelming. It manifests the surface of man's emotions in living the events, in such a way as to reveal their depth at the same time. In all this, nakedness does not have solely a literal meaning. It does not refer only to the body; it is not the origin of a shame related only to the body. Actually, through nakedness, man deprived of participation in the gift is manifested, man alienated from that love which had been the source of the original gift, the source of the fullness of the good intended for the creature.
.
According to the formulas of the theological teaching of the Church,(1) this man was deprived of the supernatural and preternatural gifts which were part of his endowment before sin. Furthermore, he suffered a loss in what belongs to his nature itself, to humanity in the original fullness of the image of God. The three forms of lust do not correspond to the fullness of that image, but precisely to the loss, the deficiencies, the limitations that appeared with sin.
.
Lust is explained as a lack which has its roots in the original depth of the human spirit. If we wish to study this phenomenon in its origins, that is, at the threshold of the experiences of historical man, we must consider all the words that God-Yahweh addressed to the woman (Gn 3:16) and to the man (Gn 3:17-19). Furthermore, we must examine the state of their consciousness. The Yahwist text expressly enables us to do so. We have already called attention to the literary specificity of the text in this connection. - Real Significance of Original Nakedness, Pope John Paul II

.

Art: The Fall of Satan.

The very perfection of the angels exposed them to the constant danger of the gifted, the danger of enchantment with the splendor of the gifts to the denial of the Giver. - My Way of Life, The Angels