All-Knowing
God is all-knowing (omniscient, all-seeing):
“And there is no creature hidden from His sight, but all things are naked and open to the eyes of Him to whom we must give account” (Heb. 4:13)
“For if our heart condemns us, God is greater than our heart, and knows all things” (1 John. 3:20)
“He said to him the third time, “Simon son of John, do you love me?” Peter felt hurt because he said to him the third time, “Do you love me?” And he said to him, “Lord, you know everything; you know that I love you.” Jesus said to him, “Feed my sheep” (John. 21:17)
“In the fullness of his knowledge the Lord distinguished them and appointed their different ways” (pSir. 33:11)
“He knows your imaginations and what you think in your hearts! Woe to those who sin and want to hide their sins!” (3Ezr. 16:63)
“When he commands, his every purpose is fulfilled, and none can limit his saving power. The works of all are before him, and nothing can be hidden from his eyes” (pSir. 39:18-19)
“Because the spirit of the Lord has filled the world, and that which holds all things together knows what is said” (pSolom. 1:7)
God knows the future
““Since times are not hidden from the Almighty, Why do those who know Him see not His days?” (Job. 24:1)
“The Lord has not empowered even his holy ones to recount all his marvelous works, which the Lord the Almighty has established so that the universe may stand firm in his glory. He searches out the abyss and the human heart; he understands their innermost secrets. For the Most High knows all that may be known; he sees from of old the things that are to come. He discloses what has been and what is to be, and he reveals the traces of hidden things” (pSir. 42:17-19)
God knows man's thoughts, feelings, and desires
“The LORD saw that the wickedness of humankind was great in the earth, and that every inclination of the thoughts of their hearts was only evil continually” (Gen. 6:5)
“O Lord, all my longing is known to you; my sighing is not hidden from you” (Ps. 38:9)
“If we had forgotten the name of our God, or spread out our hands to a strange god, would not God discover this? For he knows the secrets of the heart” (Ps. 44:20-21)
““And you, my son Solomon, know the God of your father, and serve him with single mind and willing heart; for the LORD searches every mind, and understands every plan and thought. If you seek him, he will be found by you; but if you forsake him, he will abandon you forever” (1 Chr. 28:9)
“may you hear from heaven, your dwelling place, forgive, and render to all whose heart you know, according to all their ways, for only you know the human heart” (2 Chr. 6:30)
“The Lord has not empowered even his holy ones to recount all his marvelous works, which the Lord the Almighty has established so that the universe may stand firm in his glory. <...> No thought escapes him, and nothing is hidden from him” (pSir. 42:17,20)
“But Jesus, perceiving their thoughts, said, “Why do you think evil in your hearts?” (Matt. 9:4; Luke. 5:22)
“He knew what they were thinking and said to them, …” (Matt. 12:25)
“Even though he knew what they were thinking, he said to the man …” (Luke. 6:8)
“But Jesus, aware of their inner thoughts, took a little child and put it by his side” (Luke. 9:47)
“But he knew what they were thinking and said to them, …” (Luke. 11:17)
“Then they prayed and said, “Lord, you know everyone’s heart. Show us which one of these two you have chosen” (Act. 1:24)
“And God, who knows the human heart, testified to them by giving them the Holy Spirit, just as he did to us” (Act. 15:8)
God knows all the sins of man
“O God, you know my folly; the wrongs I have done are not hidden from you” (Ps. 69:5)