1 John 3:19

By this we shall come to know that we are really of the truth,

John 13:35

By this shall all men know that you are my disciples, if you have love one for another."

John 18:37

"You are a king, then? You!" said Pilate. "You say truly that I am a king." answered Jesus, "for this purpose I was born, and to this end came I into the world, that I should bear witness to the truth. Every man who is of the truth listens to my voice."

Romans 4:21

and was fully persuaded that what God had promised, he was able also to perform.

Romans 8:38

For I am fully persuaded that neither death nor life, Neither angels nor principalities, nor powers, Neither the present world nor the world to come, Nor the powers of Nature,

2 Timothy 1:12

But I am not ashamed; for I know whom I have fully believed, and I am thoroughly persuaded that he is able to keep what I have given him until the Day.

Hebrews 6:10-11

For God is not unjust; he will not forget your work and the love you showed for his cause, in sending help to your fellow Christians, as you are still doing.

Hebrews 10:22

let us draw near with a true heart, in full assurance of faith, our hearts sprinkled from and evil conscience, and our bodies bathed in pure water.

Hebrews 11:13

These all died in faith, not having yet received the promises; nay, but they saw them from afar, and hailed them, and confessed that they were strangers and pilgrims on the earth.

1 John 1:8

If we say, "We have no sin," we are deceiving ourselves and the truth is not in us.

1 John 3:14

We know that we have migrated, out of death into life, because we love our brothers. He who has no love is abiding in death.

1 John 3:21

Beloved, if our heart condemn us not, we have confidence toward God,

Treasury of Scripture Knowledge

Summary

And hereby we know that we are of the truth, and shall assure our hearts before him.

Bible References

Shall

1 John 3:21
Beloved, if our heart condemn us not, we have confidence toward God,
Hebrews 6:10
For God is not unjust; he will not forget your work and the love you showed for his cause, in sending help to your fellow Christians, as you are still doing.
Hebrews 10:22
let us draw near with a true heart, in full assurance of faith, our hearts sprinkled from and evil conscience, and our bodies bathed in pure water.

Assure

Romans 4:21
and was fully persuaded that what God had promised, he was able also to perform.
Romans 8:38
For I am fully persuaded that neither death nor life, Neither angels nor principalities, nor powers, Neither the present world nor the world to come, Nor the powers of Nature,
2 Timothy 1:12
But I am not ashamed; for I know whom I have fully believed, and I am thoroughly persuaded that he is able to keep what I have given him until the Day.
Hebrews 11:13
These all died in faith, not having yet received the promises; nay, but they saw them from afar, and hailed them, and confessed that they were strangers and pilgrims on the earth.