Sound doctrine and discernment and spiritual warfare

Onlookers who can't understand why
Christians would be so 'mean' to those poor Federal
Visionsists and New Perspectivists and so on need to
see it like this: that which comes from the Kingdom
of Death to defile sound doctrine tries most to look
like the real thing. It's for this reason that one
can look at the average Arminian and discern that
they are really mostly just misguided. They're not
consciously mischievous. The Federal Visionsts (and
Theonomists and related types) are consciously
mischievous, and they try the most to seem orthodox
(i.e. in their case they attempt to out-Calvin real
Calvinists), but they can't disguise the Kingdom
of Death poison they exist to pour into the well.
At least they know they can't fool
God's elect, but they can fool innocents and those
yet to be regenerated by the Word and the Spirit
and also those yet to convert in a real way. This
only buys them (and their father the devil) time though.
As are all who are in conscious rebellion to God
and who think they can defeat God they are irrational
to the core. They can annoy God's plan, but they
can't defeat God's plan...

Having said that...

Sound doctrine is not just intellectual play. It
is contained in Spiritual Warfare. When you have
discernment for sound doctrine you don't just have a
set of correct statements and finely defined concepts
and terms, but you have the Spirit in you that gives
you that discernment, and with sound doctrine you know
what is not sound doctrine. You can recognize when
something comes from man rather than God, and from the
Kingdom of Death rather than the Kingdom of God.
Sound doctrine also involves your inner being. To be
able to see and accept sound doctrine means an
internal reorientation has been effected from vanity,
worldly pride, and self-will to faith, repentance, and
God's will... From resentment to gratitude. From
being man-centered to being God centered. From
judging God to seeing God as the Judge.