"The spirit of God is a spirit of peace. Even in the most serious faults He makes us feel a sorrow that is tranquil, humble, and confident. This is precisely because of His mercy.
The spirit of the devil instead excites, exasperates, and makes us feel in that very sorrow, anger against ourselves, whereas we should, on the contrary, be charitable to ourselves first and foremost. Therefore if any thought agitates you, this agitation never comes from God who gives you peace being the spirit of peace, but from the devil." ~~ St. Padre Pio