If they truly believed this, they would contemplate how he took human flesh, bore our sufferings and died for us --- contemplating to the extent of this proof:
Avoiding all impurity, or near occasions of impurity, or providing a near occasion of impurity unnecessarily for their neighbor.
Such are men who pretend that mediocrity in the spiritual life is a virtue. They will twist the words of the Holy Ghost through St. Paul, touting, 'everything in moderation' as their slogan, as if St. Paul was promoting evils as long as they were not immediately idolized. (The modernist loves this.) Really such a philosophy is a product of spiritual dispondency, evident when one ignores the actual graces given to them over time, as they become slaves to their passions. They are slaves unwittingly, because in their free will they chose the lesser goods, or even the evils over the goods, because they trained themselves to be desensitized to the evils, namely to impurity. Eventually this leads to despair of spiritual goods lost, consciously or subconsciously. Pleasure is then no longer something that is a biproduct of the goods ordered to God, but it is pursued to its own end as if he who is not God is 'God'. When this occurs, the gift of supernatural faith is diminished even against the sanctifying graces of (a valid) Baptism, to the point of being commonly non-existent. This absence of grace is the absence of God, which causes the greatest loneliness a man can face, and more frequently than not, people today are fighting this. As a result, people in this society tend to busy themselves more and more with nonsense, and promote even the vice of impurity. License has, in this way, become the new "freedom".
ECCE HOMO! Behold the God-Man who suffered and died for love of you.
The ultimate act of Love was Jesus' suffering and death, and done out of God's merciful love for us, then why be concerned? The reason is clear, because he who says he loves (God) and yet "fails to keep his commandments, is liar and the truth is not in him." Worse off are those who are lukewarm, or even yet worse, those "by whom scandal comes".
The question should be rather: Why spiritual despondency? Sin and despondency are ultimately fruits from the same bad tree: pride. However, thoughts of a despondent spirit are often from the fallen one, who especially urges those who in some ways religious, and yet have fallen by the world or the flesh. Whether they are bound by chains or by a single string, they are held back from the freedom God wishes for them in this life, then to foreshadow the eternal reward which is to come for those truly free from any affection to even venial sin.
A humble soul sees his fault, implores God's forgiveness and assistance, trusts that he will receive this assistance, then perserveres to overcome his fault, working as if all depended upon him, while in this way honors God's mercy. Such a man's main pursuit which drives him to think and act in this way is love of God born out of gratitude for what He has done, and desire to give with his being glory to God due to God alone. The prideful soul sees his fault and lacking himself in gratitude, he presumes upon God's goodness as if his path to salvation is already set, ignoring the honor he owes to God (and God alone). His faith is then small, and he puts his trust in himself, really, despite that he'd rather you think that he trusts in God, and therefore is casual about his pursuit for heaven. Since his faith in God is small, his faith in God's promise is really small, as proven by his making this life no longer a means to an eternal end, but an end itself.
A prideful soul avoids anything or any person that would remind him of his fault, allowing him to not feel badly about chosing to not give up a disordered attachment to a licit or even an illicit good. A humble soul welcomes prudent correction, and despises and seeks to avoid the spirit of falsity.
By thy holy and Immaculate heart, O Mary, make my body pure and my soul holy. Preserve me this day/night from mortal sin, and guide me that I may not commit one single, deliberate venial sin. Amen.+
Post Communion prayer for today, the Feast of St. Marcellus I, Pope and Martyr:
APPEASED by this Sacrifice, O Lord, in which Thou hast nourished Thy Church on heavenly food, do Thou so guide her that she may be steered with a firm hand and, while enjoying more liberty, may persist in wholeness of faith. Through our Lord.