Observe the difference between the presence of the life-giving spirit and the presence of the spirit that deadens and destroys your soul. When there are good thoughts in your soul you feel happy and at ease; when peace and joy are in your heart, then the spirit of good, the Holy Spirit, is within you; whilst when evil thoughts or evil motions of the heart arise within you, you feel ill at ease and oppressed; when you are inwardly troubled, then the spirit of evil, the crafty spirit, is within you.
–Saint John of Kronstadt (1829-1908)
