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Don Bosco often had apparitions of the afterlife. One of his pupils Joseph Perazzo, said:
My father's death saddened me very much, and I kept wishing to know of his state in the other world. Once, after confession, I asked Don Bosco to pray for my father. "I have seen him," Don Bosco replied. He then proceeded to describe him so minutely and accurately that I exclaimed, "Yes, that's my father; that's the way he used to dress."
"Well," Don Bosco went on, "he’s still in purgatory. Pray for him, and soon he'll be in heaven." The amazing thing is that Don Bosco had never seen or known the boy's father in this life.
But a far more frightening specter appeared to one of Don Bosco's parishioners around All Souls Day in 1865. It's lesson is timeless and he gave a chilling account of the event to his Oratory boys, resulting in one of the most remarkable Good Night Talks in the school's history.

Here are some very easy ways to gain a plenary indulgence:

-Vocal Recitation of at least 5 decades of the Rosary in a church, or oratory or when it is recited in a family, a religious community, or a pious association. And in all other circumstances, a partial indulgence is granted.

-Remaining in adoration of the Blessed Sacrament for half an hour.

-Reading sacred Scripture with the devotion due to God’s word for half an hour.

-Making the pious exercise of the Way of the Cross at legitimately erected stations.

-On each Friday of Lent a plenary indulgence is granted to those who piously recite the prayer “Look down Upon Me, Good and Gentle Jesus” after Holy Communion, before an image of Christ crucified.

"Indulgence" as defined by the Code of Canon Law (can. 992) and in the Catechism of the Catholic Church (n. 1471):

"An indulgence is a remission before God of the temporal punishment due to sins whose guilt has already been forgiven, which the faithful Christian who is duly disposed gains under certain prescribed conditions through the action of the Church which, as the minister of redemption, dispenses and applies with authority the treasury of the satisfactions of Christ and the saints".
To gain indulgences, whether plenary or partial, it is necessary that the faithful be in the state of grace at least at the time the indulgenced work is completed.  [For instance, one must be a Catholic, not excommunicated or in schism.]

A plenary indulgence can be gained only once a day. In order to obtain it, the faithful must, in addition to being in the state of grace:
have the interior disposition of complete detachment from sin, even venial sin;
have sacramentally confessed their sins;
receive the Holy Eucharist (it is certainly better to receive it while participating in Holy Mass, but for the indulgence only Holy Communion is required); pray for the intentions of the Supreme Pontiff.

It is appropriate, but not necessary, that the sacramental Confession and especially Holy Communion and the prayer for the Pope's intentions take place on the same day that the indulgenced work is performed; but it is sufficient that these sacred rites and prayers be carried out within several days (about 20) before or after the indulgenced act. Prayer for the Pope's intentions is left to the choice of the faithful, but an "Our Father" and a "Hail Mary" are suggested. One sacramental Confession suffices for several plenary indulgences, but a separate Holy Communion and a separate prayer for the Holy Father's intentions are required for each plenary indulgence.

Indulgences can always be applied either to oneself or to the souls of the deceased, but they cannot be applied to other persons living on earth.

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