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And they prayed, and said, Thou, Lord, which knowest the hearts of all men. Acts 1:24He knoweth the secrets of the heart. Psalm 44:21
Thou knowest my down-sitting and mine up-rising; thou understands my thought afar off. Thou compassest my path and my lying down, and art acquainted with all my ways. Psalm 139:2-3
And thou shalt remember all the way which the LORD thy God led thee these forty years in the wilderness, to humble thee, and to prove thee, to know what was in thine heart, whether thou wouldest keep his commandments, or no. Deuteronomy 8:2For the Lord your God proveth you, to know whether ye love the Lord your God with all your soul. Deuteronomy 13:3
God left him [Hezekiah], to try him, that he might know all that was in his heart. 2 Chronicles 32:31