1 John 3:19

And by this we know that we are of the truth, and persuade our hearts before him,

Isaiah 32:17

The work of righteousness will be peace; and the effect of righteousness, quietness and confidence forever.

John 13:35

By this everyone will know that you are my disciples, if you have love for one another."

John 18:37

Pilate therefore said to him, "Are you a king then?" Jesus answered, "You say that I am a king. For this reason I have been born, and for this reason I have come into the world, that I should testify to the truth. Everyone who is of the truth listens to my voice."

Romans 4:21

and being fully assured that what he had promised, he was also able to perform.

Romans 8:38

For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor things present, nor things to come, nor powers,

2 Timothy 1:12

For this cause I also suffer these things. Yet I am not ashamed, for I know him whom I have believed, and I am persuaded that he is able to guard that which I have committed to him against that day.

Hebrews 6:10-11

For God is not unrighteous, so as to forget your work and the labor of love which you showed toward his name, in that you served the saints, and still do serve them.

Hebrews 10:22

let's draw near with a true heart in fullness of faith, having our hearts sprinkled from an evil conscience, and having our body washed with pure water,

Hebrews 11:13

These all died in faith, not having received the promises, but having seen them and embraced them from afar, and having confessed that they were strangers and pilgrims on the earth.

1 John 1:8

If we say that we have no sin, we deceive ourselves, and the truth is not in us.

1 John 3:14

We know that we have passed out of death into life, because we love the brothers. He who doesn't love his brother remains in death.

1 John 3:21

Beloved, if our hearts don't condemn us, we have boldness 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 hearts don't condemn us, we have boldness toward God;
Isaiah 32:17
The work of righteousness will be peace; and the effect of righteousness, quietness and confidence forever.
Hebrews 6:10
For God is not unrighteous, so as to forget your work and the labor of love which you showed toward his name, in that you served the saints, and still do serve them.
Hebrews 10:22
let's draw near with a true heart in fullness of faith, having our hearts sprinkled from an evil conscience, and having our body washed with pure water,

Assure

Romans 4:21
and being fully assured that what he had promised, he was also able to perform.
Romans 8:38
For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor things present, nor things to come, nor powers,
2 Timothy 1:12
For this cause I also suffer these things. Yet I am not ashamed, for I know him whom I have believed, and I am persuaded that he is able to guard that which I have committed to him against that day.
Hebrews 11:13
These all died in faith, not having received the promises, but having seen them and embraced them from afar, and having confessed that they were strangers and pilgrims on the earth.