1 John 3:19

And in this we shall know that we are of the truth, and we shall assure our hearts before him;

John 13:35

in this shall all know that you are my disciples, if you may have divine love one with another.

John 18:37

Then Pilate said to Him, Then, art thou not a king? Jesus responded, Thou says that I am king. Unto this I was born, and unto this I have come into the world, in order that I may bear witness to the truth. Every one being of the truth hears my voice.

Romans 4:21

and being fully assured, that whatsoever he has promised, he is able also 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,

2 Timothy 1:12

on account of which cause I indeed suffer these things: but I am not ashamed; for I know whom I have believed, and am persuaded that he is able to stand guard over that which is committed unto me unto that day.

Hebrews 6:10-11

For God is not unrighteous to forget your work and the divine love which you manifested in his name, having ministered to the saints, and ministering.

Hebrews 10:22

let us draw nigh with a true heart in a full assurance of faith, having been sprinkled as to our hearts from an evil conscience,

Hebrews 11:13

These all died in the faith, not having received the promises, but seeing them afar off, and embracing them, and confessing that they are strangers and pilgrims on the earth.

1 John 1:8

But 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 the death into the life, because we love the brethren with divine love; the one loving not with divine love, abides in the death.

1 John 3:21

Beloved, if our heart may not 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 heart may not condemn us, we have boldness toward God:
Hebrews 6:10
For God is not unrighteous to forget your work and the divine love which you manifested in his name, having ministered to the saints, and ministering.
Hebrews 10:22
let us draw nigh with a true heart in a full assurance of faith, having been sprinkled as to our hearts from an evil conscience,

Assure

Romans 4:21
and being fully assured, that whatsoever he has promised, he is able also 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,
2 Timothy 1:12
on account of which cause I indeed suffer these things: but I am not ashamed; for I know whom I have believed, and am persuaded that he is able to stand guard over that which is committed unto me unto that day.
Hebrews 11:13
These all died in the faith, not having received the promises, but seeing them afar off, and embracing them, and confessing that they are strangers and pilgrims on the earth.