How to Pray Part 2

Though confession alone does not remove the temporal penalty
of sin, healing still is possible by God’s grace. Prayer, reading the
Scripture, giving alms, doing good works all are acts that have
had indulgences attached to them by the Church. By obtaining
an indulgence, the Christian receives healing from the temporal
penalty of even the gravest sins, reducing or eliminating altogether
the time of purification needed in purgatory (CCC 1471).

-The Power of the Cross 
by Michael Dubruiel