If after Holy Confession and absolution, the penitent was still in the habit of sinning especially after many years of not receiving Holy Confession, then he still might be in danger even after receiving absolution because (1) he still has not had the time to develop custody of the senses, a prayerful spirit of recollection, and the habitual grace to reject temptation and sin; and (2) just prior to the Second Coming, there will be horrific signs in the sky and on the earth that will cause most people to despair and lose their salvation. Only a few righteous people who have persevered in faith, hope, and charity, who have persevered in prayer and fasting, and who have not fallen into sin will be saved.
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Deliberate venial sins can lead to mortal sins. Habitual sins can turn our souls away from the love of God. Therefore, we must strive to avoid all sins, both mortal and venial, and we must make a firm purpose not to sin again before we begin our confession.
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Christ warned us that at His Second Coming, few will be found who have persevered in the Holy Faith and in Charity.
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So, UNLESS this penitent had repented and had determined to go to confession and avoid all sins several days before having a chance to meet with the priest, AND during this time of preparation, he had read good books, the Holy Scriptures, practiced custody of the senses, avoided all sins, thoroughly examined his conscious and made a sincere effort to confess all his sins, tried to have perfect contrition for his sins, spent hours in prayer and fasting, and had made a sincere effort to avoid all temptations and near occasions of sin, then IF he did all this, which is the preferred way to prepare for Holy Confession, then he might be able to avoid all temptations, and he might be able to keep the faith even during the trying times that precede the Second Coming of Christ.
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One must never wait until the last minute to go to confession.
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Ah, yes, this was what a Traditional priest had said during a retreat on the Second Coming of Christ.