Today's Gospel acclamation at Mass, Hebrews 4.12: The word of God is living and effective, able to discern reflections and the thoughts of the heart. The mind has its own intelligence, but God always speaks to the heart. While our intelligence remains fixed, our heart grows in knowledge as God teaches us. Also, the heart directly affects the mind. When the heart is pure, the mind is pure; if it's filthy, so will the mind be. To serve God, always think with your heart, but be aware of the Evil One attempting to contaminate your heart by manipulating your thoughts of the mind.