The Devil doesn't fear austerity but holy obedience.

If after all your efforts you cannot succeed, you could not please our Lord more than by sacrificing to Him your will, and remaining in tranquility, humility, and devotion, entirely conformed and submissive to His divine will and good pleasure.

Have patience with all things, but chiefly have patience with yourself. Do not lose courage in considering your own imperfections but instantly set about remedying them -- every day begin the task anew.

Frequent not the company of immodest persons, especially if they be also impudent, as is generally the case; ...these corrupted souls and infected hearts scarcely speak to any, either of the same or a different sex, without causing them to fall in some degree from purity; they have poison in their eyes and in their breath, like basilisks. On the contrary, keep company with the chaste and virtuous; often meditate upon and read holy things; for the word of God is chaste, and makes those also chaste that delight in it.

Those who pray from the heart do not think about the prayer they are saying, but about the God to whom they pray.

One rarely does well what one rarely does.

We must fear God out of love, not love Him out of fear.