Either say that the tree is good, and its fruit good; or say that the tree is bad, and its fruit bad; for the tree is known by its fruit. Brood of vipers!

And this is the condemnation, that the light hath come into the world, and men loved the darkness rather than the light; for their deeds were evil.

This therefore I say, and charge you in the Lord, that ye no longer walk as the rest of the gentiles walk in the vanity of their mind,

and then will the lawless one be revealed, whom the Lord Jesus will consume with the breath of his mouth, and destroy with the manifestation of his coming;

Now as Jannes and Jambres withstood Moses, so also do these withstand the truth; men corrupted in their minds, reprobate concerning the faith.

To the pure all things are pure; but to the defiled and unbelieving nothing is pure, but both their mind and conscience are defiled.

Take heed, brethren, lest there be in any one of you an evil heart of unbelief, in departing from the living God.

Look to yourselves, that ye lose not the things which ye wrought, but receive a full reward.

Supposing

But godliness with contentment is great gain.

not given to wine, not a striker, but forbearing, not quarrelsome, not a lover of money;

and said to them, It is written, "My house shall be called a house of prayer; but ye make it a den of robbers."

(...)

But Simon, seeing that the Spirit was given through the laying on of the apostles hands, offered them money,

For a certain man named Demetrius, a silversmith, made silver shrines of Diana, and brought no small gain to the craftsmen.

whose mouths must be stopped, since they overturn whole houses, teaching things which they ought not, for the sake of base gain.

and in covetousness will they with feigned words make merchandise of you; for whom the judgment long ago ordained lingereth not, and their destruction slumbereth not.

Woe to them! for they have gone in the way of Cain, and rushed on in the error of Balaam for reward, and perished in the gainsaying of Korah.

for all the nations have drunk of the wine of the wrath of her fornication, and the kings of the earth committed fornication with her, and the merchants of the earth became rich out of the abundance of her luxury.

From

But I exhort your brethren, to mark those who are causing divisions and offences, contrary to the doctrine which ye learned; and avoid them.

Now we charge you, brethren, in the name of the Lord Jesus Christ, that ye withdraw yourselves from every brother that walketh disorderly, and not after the tradition which they received of us.

having a form of godliness, but denying the power thereof. And from these turn away.

General references

but if any one be ignorant, let him be ignorant!

But the foolish and ignorant questionings avoid, knowing that they gender quarrels;