The Holy Spirit

"Although the Spirit never changes, the effects of his action, but the will of God and in the name of Christ, are both many and marvellous. The Spirit makes one person a teacher of divine truth, inspires another to prophesy, gives another the power of casting out devils, enables another to interpret Holy Scripture. The Spirit strengthens one person's self-control, shows another how to help the poor, teaches another to fast and lead a life of asceticism, makes another oblivious to the needs of the body, trains another for martyrdom. His action is different in different people, but the Spirit is always the same."

St Cyril of Jerusalem