1 John 2:21

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

2 Peter 1:12

Wherefore I will not neglect to put you always in mind of these things, though ye know them, and are established in the present truth.

Romans 15:14-15

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

Jude 1:5

But I would remind you of this, which ye know already, that though the Lord saved the people out of the land of Egypt, yet He afterwards destroyed those that believed not:

Treasury of Scripture Knowledge

Summary

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

Because ye know not

General references

Bible References

Because ye know not

Romans 15:14
And I myself am indeed persuaded concerning you, my brethren, that ye are full of goodness, being filled with all knowledge, and able to admonish one another.
2 Peter 1:12
Wherefore I will not neglect to put you always in mind of these things, though ye know them, and are established in the present truth.

General references

John 10:5
But they will not follow a stranger, but will flee from him; because they know not the voice of strangers.