"Have mercy upon me, O God, according to Your loving kindness, according to the multitude of Your tender mercies, blot out my transgressions." Psalm 51.1Every sincere prayer has an immediate answer. Especially when it's from a sinner who is repentant. Look at David, for example, who sinned greatly and God still forgave him. The same is true for you too.
The Secret: sincerity and faith.