2 Chronicles 6:29-30

what prayer and supplication soever be made by any man, or by all thy people Israel, who shall know every man his own plague and his own sorrow, and shall spread forth his hands toward this house: then hear thou from heaven thy dwelling-place, and forgive, and render unto every man according to all his ways, whose heart thou knowest (for thou, even thou only, knowest the hearts of the children of men)