"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 and this is precisely because of His mercy.The spirit of the devil, instead, excites, exasperates, and make us feel, in that very sorrow [for our sins], anger against ourselves, whereas we should, on the contrary, be charitable with 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."