Indeed, the hearts of all the children of Adam are between two Fingers of the Most Compassionate, like one heart; He directs it as He wills

The Prophet (may Allah's peace and blessings be upon him) informed that the hearts of all the children of Adam are between two Fingers of the Most Compassionate, like a single heart; He directs it as He wills. If He wills, He keeps the heart firm upon the truth, and if He wills, He leads it away from the truth. His control over all hearts is like His control over one, as nothing distracts Him from any matter.

Then the Prophet (may Allah's peace and blessings be upon him) supplicated, saying: O Allah, the Turner of the hearts, sometimes towards obedience, sometimes towards disobedience, sometimes towards remembrance, and sometimes towards heedlessness, direct our hearts towards Your obedience.