Consistently pray in all things, so that you might not do anything without the help of God ... Whoever does or busies himself with anything without prayer does not succeed in the end. Concerning this, the Lord said: "Without Me you can't do anything". (John 15:5)

Every sin that is left without repentance is a sin unto death, for which if even a saint shall pray, he shall not be heard.

In the spiritual life we can do nothing worthy without repentance, but the Lord has much mercy on us because of our intentions. He who compels himself and holds on to repentance until the end, even if he sins is saved because he compelled himself, for the Lord promised this in the Gospel.

If you want the Lord to hide your sins, then don't talk to people about what kind of virtues you have. For as we relate to our virtues, so God relates to our sins.

The devil makes small sins seem smaller in our eyes, for otherwise he can't lead us to greater evil.

When you have been insulted, cursed, or persecuted by someone, do not think of what has happened to you, but of what will come from it, and you will see that your insulter has become the cause of many benefits to you, not only in this age, but in that which is to come.

Because God's justice is inexorable, it is hard to obtain forgiveness for sins committed with complete deliberation.