1 John 3:19

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

Isaiah 32:17

And a work of the righteousness hath been peace, And a service of the righteousness -- Keeping quiet and confidence unto the age.

John 13:35

in this shall all know that ye are my disciples, if ye may have love one to another.'

John 18:37

Pilate, therefore, said to him, 'Art thou then a king?' Jesus answered, 'Thou dost say it; because a king I am, I for this have been born, and for this I have come to the world, that I may testify to the truth; every one who is of the truth, doth hear my voice.'

Romans 4:21

and having been fully persuaded that what He hath promised He is able also to do:

Romans 8:38

for I am persuaded that neither death, nor life, nor messengers, nor principalities, nor powers, nor things present,

2 Timothy 1:12

for which cause also these things I suffer, but I am not ashamed, for I have known in whom I have believed, and have been persuaded that he is able that which I have committed to him to guard -- to that day.

Hebrews 6:10-11

for God is not unrighteous to forget your work, and the labour of the love, that ye shewed to His name, having ministered to the saints and ministering;

Hebrews 10:22

may we draw near with a true heart, in full assurance of faith, having the hearts sprinkled from an evil conscience, and having the body bathed with pure water;

Hebrews 11:13

In faith died all these, not having received the promises, but from afar having seen them, and having been persuaded, and having saluted them, and having confessed that strangers and sojourners they are upon the earth,

1 John 1:8

if we may say -- 'we have not sin,' ourselves we lead astray, and the truth is not in us;

1 John 3:14

we -- we have known that we have passed out of the death to the life, because we love the brethren; he who is not loving the brother doth remain 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,
Isaiah 32:17
And a work of the righteousness hath been peace, And a service of the righteousness -- Keeping quiet and confidence unto the age.
Hebrews 6:10
for God is not unrighteous to forget your work, and the labour of the love, that ye shewed to His name, having ministered to the saints and ministering;
Hebrews 10:22
may we draw near with a true heart, in full assurance of faith, having the hearts sprinkled from an evil conscience, and having the body bathed with pure water;

Assure

Romans 4:21
and having been fully persuaded that what He hath promised He is able also to do:
Romans 8:38
for I am persuaded that neither death, nor life, nor messengers, nor principalities, nor powers, nor things present,
2 Timothy 1:12
for which cause also these things I suffer, but I am not ashamed, for I have known in whom I have believed, and have been persuaded that he is able that which I have committed to him to guard -- to that day.
Hebrews 11:13
In faith died all these, not having received the promises, but from afar having seen them, and having been persuaded, and having saluted them, and having confessed that strangers and sojourners they are upon the earth,