Modern technology allows medical science to scan and analyze the human body with astonishing precision. Yet, no instrument can truly read a person’s heart or mind. These remain hidden from human insight—but not from God.
Scripture affirms this truth:
🧠 Jeremiah 17:9–10 “The heart is deceitful above all things, and desperately sick; who can understand it? I the LORD search the heart and test the mind, to give every man according to his ways, according to the fruit of his deeds.”
👀 1 Samuel 16:7 “But the LORD said to Samuel, ‘Do not look on his appearance or on the height of his stature, because I have rejected him. For the LORD sees not as man sees: man looks on the outward appearance, but the LORD looks on the heart.’”

In Psalm 17, David is in crisis—and he turns to God with a clear and honest heart. He says confidently:
🛐 “You have tried my heart, you have visited me by night; you have tested me, and you will find nothing.”
This isn’t boasting; it’s the quiet assurance of a man whose conscience is clear before God. David trusted that he had passed the deepest and most divine diagnostic—one no earthly device could perform:
✅ Diagnosis Result: Test Passed.