"A man is not freed from the allurements of sin in his heart until he hates from [the depth of] his heart and sincerely the cause of sin. This causes the vehemence of the struggle which opposes man in the blood and in which his freedom is testified to through the purity of his love of virtues."
- Saint Isaac the Syrian
Reference: http://www.archive.org/details/IsaacOfNinevehMysticTreatises