Every irritation comes from our pride. Why do you get irritated with another person, why do you feel malice toward them? Because deep inside, you consider yourself to be something more than the other.
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Throughout the day, try to remember God more often. If you feel bad, turn to Him: "Lord, I feel bad, help me." If you feel good: "Lord, glory to You, thank You for this joy." If you are worried about someone: "Lord, I am worried about him, help him." Whatever happens, turn it into prayer.
Ambrose of Optina