So back to @heymike3’s suggestion of examining the topic of our knowing as supported in the NT, not that anyone is necessarily interested anymore, but here are the results so far:
The second and third hits on the first search link above (BibleGateway) are not exactly to the question of our knowing, so they may be false positives in that sense, but they are on topic because they do indeed speak to fearful and unbelieving doubt:
Matthew 6:8 Do not be like them, for your Father knows what you need before you ask him.
Matthew 6:32 For the pagans run after all these things, and your heavenly Father knows that you need them.
On the topic of our knowing:
Matthew 11:27 “All things have been committed to me by my Father. No one knows the Son except the Father, and no one knows the Father except the Son and those to whom the Son chooses to reveal him.
Matthew 13:11 He replied, “Because the knowledge of the secrets of the kingdom of heaven has been given to you, but not to them.
Mark 2:10 But I want you to know that the Son of Man has authority on earth to forgive sins.”
Luke 1:4 …so that you may know the certainty of the things you have been taught.
Luke 1:77 …to give his people the knowledge of salvation through the forgiveness of their sins,
Luke 5:24 But I want you to know that the Son of Man has authority on earth to forgive sins.” So he said to the paralyzed man, “I tell you, get up, take your mat and go home.”
Luke 8:10 He said, “The knowledge of the secrets of the kingdom of God has been given to you, but to others I speak in parables, so that, “‘though seeing, they may not see; though hearing, they may not understand.’
Luke 10:22 “All things have been committed to me by my Father. No one knows who the Son is except the Father, and no one knows who the Father is except the Son and those to whom the Son chooses to reveal him.”
John 1:18 No one has ever seen God, but the one and only Son, who is himself God and is in closest relationship with the Father, has made him known.
John 3:11 Very truly I tell you, we speak of what we know, and we testify to what we have seen, but still you people do not accept our testimony.
John 4:42 They said to the woman, “We no longer believe just because of what you said; now we have heard for ourselves, and we know that this man really is the Savior of the world.”
John 6:69 We have come to believe and to know that you are the Holy One of God.”
John 8:32 Then you will know the truth, and the truth will set you free.”
John 9:31 We know that God does not listen to sinners. He listens to the godly person who does his will.
John 10:4 When he has brought out all his own, he goes on ahead of them, and his sheep follow him because they know his voice.
John 10:14 “I am the good shepherd; I know my sheep and my sheep know me
John 10:38 But if I do them, even though you do not believe me, believe the works, that you may know and understand that the Father is in me, and I in the Father.”
John 13:17 Now that you know these things, you will be blessed if you do them.
John 14:17 …the Spirit of truth. The world cannot accept him, because it neither sees him nor knows him. But you know him, for he lives with you and will be in you.
John 15:15 I no longer call you servants, because a servant does not know his master’s business. Instead, I have called you friends, for everything that I learned from my Father I have made known to you.
John 15:21 They will treat you this way because of my name, for they do not know the one who sent me.
John 16:3 They will do such things because they have not known the Father or me.
[Those last two imply by contrast that we who are his disciples do know him.]
John 16:14 He will glorify me because it is from me that he will receive what he will make known to you.
John 16:15 All that belongs to the Father is mine. That is why I said the Spirit will receive from me what he will make known to you.”
John 17:3 Now this is eternal life: that they know you, the only true God, and Jesus Christ, whom you have sent.
John 17:7 Now they know that everything you have given me comes from you.
John 17:25-26 “Righteous Father, though the world does not know you, I know you, and they know that you have sent me. I have made you known to them, and will continue to make you known in order that the love you have for me may be in them and that I myself may be in them.”
John 21:24 This is the disciple who testifies to these things and who wrote them down. We know that his testimony is true.
That appears to about do it… for just the gospels. ; - )