I feel deeply the painfulness of speaking out on these subjects. I know well that speaking plain about false doctrine is very unpopular, and that the speaker must be content to find himself being thought of as very uncharitable, very troublesome, and very narrow-minded.

Most people can never distinguish differences in religion.

To the bulk of men a clergyman is a clergyman, and a sermon is a sermon, and as to any difference between one minister and another, or one doctrine and another, they are utterly unable to understand it.

I cannot expect such people to approve of any warning against false doctrine.

I must make up my mind to meet with their disapproval, and must bear it as I best can. But I will ask any honest-minded, unprejudiced Bible reader, to turn to the New Testament and see what he will find there. He will find many plain warnings against false doctrine:

Watch out for false prophets!
Matthew 7:15

See to it that no one takes you captive through hollow and deceptive philosophy!
Colossians 2:8

Do not be carried away by all kinds of strange teachings!
Hebrews 13:9

Do not believe every spirit—but test the spirits to see whether they are from God.
1 John 4:1”

~J.C. Ryle