In Catholic theology, illumination signifies a profound inner transformation fueled by divine grace. It's not a sudden flash of insight, but a gradual process of spiritual growth. This illumination deepens one's understanding of God and his will, leading to a moral transformation. Through prayer, sacraments, and virtuous living, the individual experiences a growing awareness of God's presence and a strengthened desire to follow his teachings. This ongoing illumination becomes a powerful catalyst for positive change, guiding the believer along the path to holiness and shaping their life according to God's plan.