Some theologians interpret purgatory in the first sense. It is the caressing hand of the heavenly Father or a fatherly loving embrace that cleanses and purifies the soul. Others see in purgatory the hand of the Father punishing the mischievous child and causing it pain. In past ages many considered the divine fire to be real fire. Others, however, consider it symbolic fire.
Some modern theologians consider purgatory the last step of divine healing.
The first act of healing is the Sacrament of Baptism. Every time I receive the Sacrament of Penance I expose myself to the healing grace of my Father in heaven. If I enter eternity with some illness, human imperfection, and weakness, purgatory will be the last healing action of the divine physician removing the last traces and scars of my earthly battle. This could be painful, but I see no divine revenge in it. It is God's tender love making me ready for an eternity without suffering and tears, without weakness and imperfection.