2 Peter 1:12

Wherefore, I will not neglect to put you always in remembrance of these things, although you know, and are established in the present truth.

1 John 2:21

I have not written to you because you know not the truth, but because you know it, and that no lie is of the truth.

2 Peter 1:5-8

And for this very reason, indeed, giving all diligence, add to your faith, courage; and to courage, knowledge;

Jude 1:20-23

But you, beloved, building up yourselves on your most holy faith, praying with a holy spirit;

Treasury of Scripture Knowledge

Summary

And I myself also am persuaded of you, my brethren, that ye also are full of goodness, filled with all knowledge, able also to admonish one another.

Able

Bible References

I

2 Peter 1:12
Wherefore, I will not neglect to put you always in remembrance of these things, although you know, and are established in the present truth.
1 John 2:21
I have not written to you because you know not the truth, but because you know it, and that no lie is of the truth.

Able

Jude 1:20
But you, beloved, building up yourselves on your most holy faith, praying with a holy spirit;