8 Finally, all of you be of one mind, having compassion for one another; love as brothers, be tenderhearted, be courteous;
9 not returning evil for evil or reviling for reviling, but on the contrary blessing, knowing that you were called to this, that you may inherit a blessing.
10 For
“He who would love life
And see good days,
Let him refrain his tongue from evil,
And his lips from speaking deceit.
11 Let him turn away from evil and do good;
Let him seek peace and pursue it.
12 For the eyes of the Lord are on the righteous,
And His ears are open to their prayers;
But the face of the Lord is against those who do evil.”
~ 1 Peter 3:8-12
Now finally, we are at how Christians should behave. You are to be unified. With diversity comes disunity, but it doesn't have to be that way. Everyone has different views on the way you are supposed to cut a board or bake a cake. However those are, in the end, not that important. They are not salvation issues. At least I never heard of anyone not being saved simply because their personal preferences were for an earlier dinner instead of a later one. So please, don't be disgruntled at one another.
Instead have compassion. Is someone dealing with stressful events in their lives? Are they tired or depressed? Don't tell them all the things they are doing wrong. Instead ask how you can help them or encourage them. That question does more good than you can know.
In the Bible, there are many types of love. The most commonly form of love used was the one meaning lust. This verse specifically says to love as brothers. They are close and important people in your life. So take care of them, respect them, and don't hurt them with your words (to them or about them) or actions. Treat them gentle with care and show them the consideration that we all wish for.
This isn't just in the New Testament. God's words are also found in the Old Testament. If you want to live a good life, don't say things that hurt. Don't lie. Simply live a good live doing good things that lead to peace. In fact pursue peace as much as possible. God watches and listens to those who live this way. If you hurt others, are unforgiving, and show no concern for those around you then God will be your foe.