1 John 3:19

By this we know that we are of the truth and will convince our heart before him,

Isaiah 32:17

And the work of righteousness will be peace, and the work of righteousness, quietness and security forever.

John 13:35

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

John 18:37

Then Pilate said to him, "So then you are a king!" Jesus replied, "You say that I am a king. For this [reason] I was born, and for this reason I have come into the world: in order that I can testify to the truth. Everyone who is of the truth hears my voice."

Romans 4:21

and being fully convinced that what he had promised, he was also able to do.

Romans 8:38

For I am convinced that neither death, nor life, nor angels, nor rulers, nor things present, nor things to come, nor powers,

2 Timothy 1:12

for which reason also I suffer these [things]. But [I am] not ashamed, because I know in whom I have believed, and I am convinced that he is able to guard [what] I have entrusted until that day.

Hebrews 6:10-11

For God [is] not unjust, [so as] to forget your work and the love which you demonstrated for his name [by] having served the saints, and continuing to serve [them].

Hebrews 10:22

let us approach with a true heart in the full assurance of faith, our hearts sprinkled [clean] from an evil conscience and our bodies washed with pure water.

Hebrews 11:13

These all died in faith without receiving the promises, but seeing them from a distance and welcoming [them], and admitting that they were strangers and temporary residents on the earth.

1 John 1:8

If we say that we do not have sin, we deceive ourselves and the truth is not in us.

1 John 3:14

We know that we have passed over from death to life because we love the brothers. The one who does not love remains in death.

1 John 3:21

Dear friends, if our heart does not condemn [us], we have confidence before 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
Dear friends, if our heart does not condemn [us], we have confidence before God,
Isaiah 32:17
And the work of righteousness will be peace, and the work of righteousness, quietness and security forever.
Hebrews 6:10
For God [is] not unjust, [so as] to forget your work and the love which you demonstrated for his name [by] having served the saints, and continuing to serve [them].
Hebrews 10:22
let us approach with a true heart in the full assurance of faith, our hearts sprinkled [clean] from an evil conscience and our bodies washed with pure water.

Assure

Romans 4:21
and being fully convinced that what he had promised, he was also able to do.
Romans 8:38
For I am convinced that neither death, nor life, nor angels, nor rulers, nor things present, nor things to come, nor powers,
2 Timothy 1:12
for which reason also I suffer these [things]. But [I am] not ashamed, because I know in whom I have believed, and I am convinced that he is able to guard [what] I have entrusted until that day.
Hebrews 11:13
These all died in faith without receiving the promises, but seeing them from a distance and welcoming [them], and admitting that they were strangers and temporary residents on the earth.