Everything needs to be in its proper place in the true gospel.
What can be truth in one proportion can become apostate in another. You can take many of the practices of the gospel and inflate them so large that they no longer fit into their proper place. In fact, this is quite common to do in a Sunday School lesson. We take the assigned topic and inflate it out of all proportion, growing out of all bounds.
An otherwise good principle can become apostate in its isolation from the rest of the gospel.