St. Basil the Great.
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"Abba Poemen said, "As the breath which comes out of his nostrils, so does a man need humility and the fear of God."
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"For sin is what is not swiftly washed away by penitence, or sin is the cause of sin, or sin is also the punishment for sin, or sin is at once both the cause and the punishment of sin. For every act which is committed is first sin. But if it is not cleansed swiftly by penitence Almighty God by righteous judgement allows the guilty mind of the sinner to fall to further guilt, so that the mind which was unwilling to cleanse what it had done by weeping and correction begins to add sin to sin. Therefore the sin which is not washed away by the lament of penitence is at the same time the cause of sin, because from it arises whence the spirit of the sinner plunges deeper into guilt. Truly sin which follows from sin is at the same time a sin and the penalty for sin, because with increasing blindness it is generated from the retribution of prior guilt so that certain punishments are, as it were, the very increase of vices in the sinner."
St. Gregory the Great.
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"'And forgive us our debts as we also forgive our debtors.' For we have many sins. For we offend both in word and in thought, and very many things we do worthy of condemnation; and 'if we say that we have no sin' (I Jn. 1:8), we lie, as John says...The offenses committed against us are slight and trivial, and easily settled; but those which we have committed against God are great, and need such mercy as His only is. Take heed, therefore, lest for the slight and trivial sins against you, you shut out for yourself forgiveness from God for your very grievous sins."
St. Cyril of Jerusalem
(Catechetical Lectures: Lecture 23 no. 16)