We cannot afford morbid suspicion of other brethren in the army of Christ. We must not allow ourselves to sink to the low level of assuming that every brother is unfaithful until he proves himself to our satisfaction. "To his own Lord he standeth or falleth" (Rom. 14:4).  If a man is a fellow-Christian, if he is fighting the good fight of faith and resisting the devil, I should welcome him as my comrade in arms. This is the lesson Jesus taught in Mark 9:38-40.  I should respect him as such until he demonstrates otherwise. If I only trust and count as faithful those whom I personally know, then my army will amount to a handful at best.

We cannot afford to listen to the whispers of gossips that would try to set us one against the other.  In war, one branch of the military pursues psychological tactics. They spread disinformation, rumors and other methods of confusing the enemy and turning them one against the other.  Satan has used this ploy to great advantage in our day. "A perverse man scattereth abroad strife; and a whisperer separateth chief friends" (Prov. 16:28).

We cannot afford to demand perfect agreement on every jot and tittle before we can stand with a brother in the battle against the change agents. It is inevitable that there will be matters of judgment on which we disagree. 
There will be some scriptures we don't understand the same.  There will be methods or strategies that one will use that the other will not pursue. But remember we all are fighting for a common cause, the precious church of our Lord Jesus.  That I am not comfortable with one method or strategy of battle does not mean it is wrong. Fundamental and clearly revealed doctrine we do not negotiate on, but there are many other items wherein we can tolerate each other for the greater Cause we serve.

We cannot afford a narrow, shortsighted approach in this warfare.  The battle for the heart of the church is far wider and much more than just the congregation where I preach. While that is surely vital and important, the Church of Christ is the Lord's family around the world. If I can help to advance the Cause or to defend it in another city, state or nation, it is my duty to do what I can. Sometimes we see men whose only interest is in protecting the church from whence their salaries flow. Such is not a proper attitude for a noble soldier of the cross.

We must not spend our powder and shot on our fellow soldiers.  There is a misguided view in some quarters that by blasting away at a fellow-preacher we are preaching the gospel and defending the Cause of Christ.  They care not that he is serving God to the best of his ability; faithfully preaching the truth of the gospel as he understands it. While we shoot at each other, or defend our backs, the enemy gains the victory by default.  How tragic. Paul warned, ‘if ye bite and devour one another, take heed that ye be not consumed one of another" (Gal. 5:15).

We cannot afford a mean hateful spirit if we wish to win the hearts and confidence of our brethren and keeping them from following the pipers of "change." The change agents have capitalized on that very attitude to persuade many that those who oppose them are narrow, sectarian bigots whom no one should heed. Even in a pitched battle, we must "speak the truth in love" (Eph. 4:15). Our speech must be with grace, seasoned with salt (Col.4:6); that is if we are serious about winning.

We cannot afford a scorched earth policy. Gen. Tecumseh Sherman brought the South to her knees in the Civil War but the destruction he visited on the people made his name a hiss and a by word for a hundred years. It created a spirit of sullen hostility toward the victors that lived on for much of a century.  Some preachers seem to operate by this principle. They are unwilling to exercise patience; not interested in salvaging a brother, a good work, a congregation; just to destroy them if they have imbibed or tolerated some error in this conflict.  Such victories can cost us the war, if disciples refuse to hear us because of that attitude.