1 John 3:19

In this way we shall know by experience that we are on the side of the truth, and satisfy our consciences in God's sight,

John 13:35

By this everybody will know that you are my disciples, if you keep on showing love for one another."

John 18:37

Then Pilate said to Him, "So you are a king then?" Jesus answered, "Certainly I am a king. For this very purpose I was born, for this very purpose I have come into the world, to testify for truth. Everybody who is a friend of truth listens to my voice."

Romans 4:21

in full assurance that He was able to do what He had promised.

Romans 8:38

For I have full assurance that neither death nor life nor angels nor principalities nor the present nor the future

2 Timothy 1:12

This is why I am suffering so, but I am not ashamed of it, for I know whom I have trusted and I am absolutely sure that He is able to guard what I have entrusted to Him until that day.

Hebrews 6:10-11

For God is not so unjust as to forget the work you have done and the love you have shown His name in the service you have rendered for your fellow-Christians, and still are doing.

Hebrews 10:22

let us continue to draw near to God with sincere hearts and perfect faith; with our hearts cleansed from the sense of sin, and our bodies bathed in clean water;

Hebrews 11:13

These people all died victoriously as a result of their faith, although they did not receive the blessings promised; that is, because they really saw them in the far-off future and welcomed them, and so professed to be only foreigners and strangers here on earth.

1 John 1:8

If we claim "We are already free from sin," we are deceiving ourselves and the truth is not in our hearts.

1 John 3:14

We know that we have passed out of death into life, because we love our brothers. Whoever does not continue to love continues still in death.

1 John 3:21

Dearly beloved, if our consciences do not condemn us, we come with perfect confidence to 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
Dearly beloved, if our consciences do not condemn us, we come with perfect confidence to God,
Hebrews 6:10
For God is not so unjust as to forget the work you have done and the love you have shown His name in the service you have rendered for your fellow-Christians, and still are doing.
Hebrews 10:22
let us continue to draw near to God with sincere hearts and perfect faith; with our hearts cleansed from the sense of sin, and our bodies bathed in clean water;

Assure

Romans 4:21
in full assurance that He was able to do what He had promised.
Romans 8:38
For I have full assurance that neither death nor life nor angels nor principalities nor the present nor the future
2 Timothy 1:12
This is why I am suffering so, but I am not ashamed of it, for I know whom I have trusted and I am absolutely sure that He is able to guard what I have entrusted to Him until that day.
Hebrews 11:13
These people all died victoriously as a result of their faith, although they did not receive the blessings promised; that is, because they really saw them in the far-off future and welcomed them, and so professed to be only foreigners and strangers here on earth.