Jeremiah 17:10

I the LORD search the heart, I test the mind, even to give every man according to his ways, and according to the fruit of his doings.
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Athanasius the Apostolic

AD 373
For such things as these serve for exercise and trial, so that, having proved ourselves zealous and chosen servants of Christ,we may be fellow heirs with the saints. For thus Job: “The whole world is a place of trial to people on the earth.” Nevertheless, they are proved in this world by afflictions, labors and sorrows, to the end that each one may receive of God such reward as is appropriate for him, as he said by the prophet, “I am the LORD who tries the hearts and searches the reins, to give to everyone according to his ways.” - "Festal Letters 13.1"

Augustine of Hippo

AD 430
God searches our heart and perceives that it is there where our treasure is, that is, in heaven.… He alone perceives what in our inward conscience each of us thinks and delights in. Delight is the end of care because our whole goal in life is to reach what we think and care about most and attain it. God, who searches the heart, therefore sees our cares.… And when he finds that our cares incline neither to the lust of the flesh, nor to the lust of the eyes, nor to the pride of life … but to the joys of things eternal, which are spoiled by no change, he provides direction for the righteous. - "Expositions of the Psalms 7.9"

John Chrysostom

AD 407
That it belongs to God alone to know people’s secrets, hear what the prophet says: “You alone know the heart,” and again, “God examines the heart and the seat of emotions,” and Jeremiah, too, says, “The heart is inscrutable above all things, and he is man, and who shall know him?” and, “People shall look on the face but God on the heart.” - "Homilies on the Gospel of Matthew 29.2"

Tertullian of Carthage

AD 220
The Pharisees, by justifying themselves before people, were placing in people their hope of reward. His rebuke to them had the same bearing as that of the prophet Jeremiah, “Cursed is the one who trusts in humankind.” He says next, “But God knows your hearts.” This was a reference to the power of that God who declared himself a shining light, “searching the hearts and the seats of emotions.” If he turns with hostility toward their pride, “what is exalted among people is an abomination in the sight of God,” he sets Isaiah in front of their eyes, “For the LORD of hosts has a day against all that is proud and lofty, against all that is lifted up and high.” - "Against Marcion 4.33"

Tertullian of Carthage

AD 220
God has promised that Christ will be a light and has declared that he himself is a lantern, searching the hearts and seats of affections. - "Against Marcion 5.7"

Knowing this first, that no prophecy of the scripture is of any private interpretation - 2 Peter 1:20

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