The stations of the cross are a sacramental.
In looking at one station he sees Our Lord on trial before
Pilate;
in another he sees Him crowned with thorns;
in another, scourged;
in another, carrying His Cross;
in another, crucified;
in another, dead and laid in the tomb.
Before all these pictures he reflects on the sufferings of Our
Saviour,
and begins to hate sin, that caused them. Then he thinks, of his
own sins, and
begins to be sorry for them. This sorrow, caused by going around
the stations,
brings him grace that remits venial sins. When we receive the
Sacraments we
always get the grace of the Sacraments when we are rightly
disposed; but in
using the sacramentals, the more devotion we have the more grace we
receive.
(Baltimore Catechism Part 4 Lesson 27)