“All who die in God’s grace and friendship, but still imperfectly purified, are indeed assured of their eternal salvation; but after death they undergo purification, so as to achieve the holiness necessary to enter the joy of heaven.”
Rome’s catechism uses good words like “grace” and “eternal salvation,” but this teaching is anything but good and it is certainly not biblical! Charles Hodge wrote a helpful critique of purgatory in his Systematic Theology. I’ll quote parts of it below:
The first, most obvious, and, for Protestants, the most decisive argument against the doctrine [of purgatory] is, that it is not taught in the Bible. ….There is no passage that asserts it. There is no evidence that it formed a part of the instructions of Christ or his Apostles.
…[The doctrine of purgatory] rests avowedly on the assumption that notwithstanding the infinitely meritorious sacrifice of Christ, the sinner is bound to make satisfaction for his own sins. This the Bible declares to be impossible. No man does or can perfectly keep the commandments of God, much less can he not only abstain from incurring new guilt, but also make atonement for sins that are past.
The doctrine [of purgatory] moreover assumes the merit of good works. Here again it is clearer than the sun that the New Testament teaches that we are saved by grace and not by works; that to him that worketh, the reward is a matter of debt; but to him who simply believes, it is a matter of grace; and that the two are incompatible.
What is of grace is not of works; and what is of works is not of grace. There is nothing more absolutely incompatible with the nature of the Gospel than the idea that man can “satisfy divine justice” for his sins. Yet this idea lies at the foundation of the doctrine of purgatory. If there be no satisfaction of justice, on the part of the sinner, there is no purgatory, for, according to Romanists, purgatory is the place and state in which such satisfaction is rendered. As the renunciation of all dependence upon our own merit, of all purpose, desire, or effort to make satisfaction for ourselves, and trusting exclusively to the satisfaction rendered by Jesus Christ, is of the very essence of Christian experience, it will be seen that the doctrine of purgatory is in conflict not only with the doctrines of the Bible but also with the religious consciousness of the believer….