Mainly through sins of impurity, do the forces of darkness subjugate souls.
The good of our soul is more important than that of our body; and we have to prefer the spiritual welfare of our neighbor to our bodily comforts. . . If a certain kind of dress constitutes a grave and proximate occasion of sin, and endangers the salvation of your soul and others, it is your duty to give it up.
The more pure and chaste is a soul, the more it hungers for this Bread [Jesus in the Eucharist], from which it derives strength to resist all temptations to sins of impurity, and by which it is more intimately united with the Divine Spouse; 'He who eats My Flesh and drinks My Blood, abides in Me and I in him'