Dear Angel,
Please, every day, stand guard at the door of my heart. Please, shield it from resentment, anger, greed, deceit, envy, pride, jealousy and any other low-frequency emotion. Purify, protect and uplift my heart so that it may always be aligned to the high frequencies of your loving light. Thank You. Amen

Source: from our Book 365 Prayers to the Angels: Get your prayers answered and fulfill all your dreams with the help of the Angels