[St. John Paul II was one of many luminaries who believed Garabandal was authentic: https://www.privaterevelation.org/post/some-very-notable-believers-in-the-garabandal-apparitions ]
October 18, 1961
“Many Sacrifices must be made. Much penance must be done. We must pay many visits to the Blessed Sacrament, but first of all we must be very good. If we do not do this, punishment awaits us. Already the cup is filling, and if we do not change we shall be punished.”
June 18, 1965
[It hurt Her so much to give this message, She had St. Michael say it for Her.]
“Since my message of October 18, 1961 has not been complied with and has not been made much known to the world, I will tell you that this is the last one. Before the chalice was filling now it is overflowing. Many Cardinals, many Bishops, and many Priests are on the path of perdition and they take many souls with them. To the Eucharist, there is given less and less importance. We should avoid the wrath of God on us by our good efforts. If you ask pardon with your sincere soul God will pardon you. It is I, your mother, who through the intercession of St. Michael, wish to say that you amend, that you are already in the last warnings and that I love you much and do not want your condemnation. Ask Us sincerely and we will give to you. You should sacrifice more. Think of the passion of Jesus.”