Divided against itself, a house cannot stand.
Reading through the book of Mark, you will come across the following passage: "And if a house be divided against itself, that house cannot stand. And if Satan rise up against himself, and be divided, he cannot stand, but hath an end. No man can enter into a strong man's house, and spoil his goods, except he will first bind the strong man; and then he will spoil his house."
The passage is Jesus speaking to His accusers, who are seeking to discredit His work, but the underlying truths are about facts that all too often occur right under our noses. The facts illustrate how often we fail to see the destruction of our lives taking place - very slowly, over time, slowly eroding trust, relationships and love for one another. Jesus then continues in telling His listeners another fact, and that is if the devil were doing good things, how can the devils work continue... Lastly, Christ provides another view of the truth, and that is - all it takes is for one party to hear another thought, opinion or story to become divided on what he believes.
You see, regardless of whether we are spiritually weak or strong, we must always be mindful of our thoughts, and where our hearts are at. It is very easy to hear something, and allow that something to taint our belief. This is how the devil works. Using small, almost unseen details, the devil weaves for those who listen a story, casting shadows of doubt into our minds. When we are divided on issues, including the word, he knows we are likely to avoid one another - possibly even fight one another.
This is why Christ says to love one another, and not to forsake the gathering of the people (those who follow Christ). We are to remain accountable to one another also - and we are to bolster one another up, encourage each other at all times. Christians follow His orders, practicing those commands daily. Exercising the message of the gospel, this is our mission. In doing so, you'll keep your house in tact, solid and secure.