Those who think that they do not have any great sins are actually blind. They must pray to God to enable them to perceive their sins and to save themselves from the extremely fatal spiritual delusion that they do not have any particular sins. Even if their sins are as small as specks of dust, if they are not cleaned with constant Confession, they pile up and dirty the room of the heart so that the high heavenly Guest cannot enter there.
The small sins are often more dangerous than the greatest crimes, because the latter weigh heavily on the conscience and insist on being atoned for, confessed, settled, erased, while the small sins do not weigh too much on the soul, but they have that perilous property of making it insensitive to the grace of God and indifferent to salvation. Fewer people have perished from ferocious wild beasts than have from small microbes, invisible to the naked eye. By being considered insignificant, the small sins are usually passed by without any attention. They are easily forgotten, but they create in man the most terrible habit - the habit of sinning, of dulling his moral consciousness.
+Archimandrite Seraphim (Aleksiev), from The Forgotten Medicine, The Mystery of Repentance, Chapter 4, Objections to Confession
