It might be worth while mentioning the "Renaissance Papacy" in general. This period, which extended from the papacy of Paul II (1464-71) up to Pius IV (1159-65), has the reputation for producing popes who were alll either immoral, corrup , or both. This is not in fact the case. With the exception of Pope Alexanded VI already mentioned, many of these popes were in fact neither corrupt nor immoral. It must be admitted, though, that they may not have given the Church the leadership She needed during this time, especially with regard to reform and he calling of the needed Council (namely, Trent). Pope Sixtus IV (1471-84), for example, was a holy man. Julius II (1503-13) certainly loved the Church, and was the pope responsible for commissioning the new St. Peter's. But he wasn't as comitted to reform as perhaps he should have been. Even Pope Leo X (1513-21) was not a corrupt man, though his lifestyle was self-indulgent. Pope Adrian VI (1522-3) was a holy man. With the exception of Julius III (1550-5) the later popes of this period (Paul III (1534-49), Marcellus II (1555), Paul IV (1555-9) and Pius IV (1559-65)) all were committed to reform.
Regarding the sanctity of those popes who have not been beatified/canonized, I don't think it's possible to cover them all, just to mention one other holy pope of recent times. Pope Pius XII, he who has been greatly maligned, was certainly a holy man. Bear in mind also the suffering endured for the Church by those popes who have not been canonized, for example Pope Pius VII (1800-23), imprisoned by Napoleon during the latter's fleeting empire.
So in conclusion, I would say that the popes in general have shown a great deal of sanctity in their lives. 32 percent have been declared to be in heaven officially by the Church, other have shown holiness also. Only a handful have been truly corrupt. It is surely a sign of the divine institution of the Papacy that this is so. Even those corrupt popes never taught anything against faith or morals. Pope Vigilius (6th century) had even agreed with the Emperor to heresy if he bacame pope, and when he was in fact elected, he didn't go through with it.
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The moral deficiencies of the original Protestant so-called "reformers" were the MOTIVE, for their apostasy. It was not merely that they were sinners. They were sinners who apostatized BECAUSE of their sins.
If Henry VIII did not want to divorce his sacramentally married wife, marry his chippie mistress, steal Church lands and use the money to pay off his personal debts, England would still be Catholic.
If Martin Luther did not suffer from severe bipolar manic-depressant illness with frank psychosis during his periods of mania, he would never have invented a purely formal definition of 'righteousness' that was evacuated of all moral content and inspired millions of others to settle for a sub-Christian notion of discipleship…
If Zwingli the priest had not been a sex crazed rogue who seduced the young women in his congregation...
If Calvin had not been an egomaniac who had murderous intent against anyone who had the temerity to disagree with his views...
If Knox had not been part of the assassination team that murdered Cardinal Beaton...
The faults of the so-called "reformers" are central to their apostasy.
To turn around and complain that some Catholics may not have been nice is besides the point. No matter how mean some of them were, they stayed in the Church. Jesus said that he had come to save sinners, not righteous people. In light of that, claiming that Catholics were sinners therefore someone needed to found a new Church makes no sense! Sinners need to be in THE Church and no other.
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