Finally, all of you, live in harmony with one another; be sympathetic, love as brothers, be compassionate and humble. (1 Peter 3:8)
What does it mean to love like brothers?
Brothers are loyal, protect each other, have fun. But brothers fight. Alot. Brothers actually probably fight more than friends or acquaintances or maybe even lovers. But the thing that sets them apart when they do fight, is that they will protect each other no matter what disagreement has risen between them, and ideally, they will ultimately forgive.
If we are to love like brothers, as Christians, we must expect to fight with other Christians. We will disagree on theology and how church should be done. We may even have qualms with each other personally. But we must remember that, no matter what, we are brothers, bound by Christ and grafted into the family of God. Though we disagree, we must remain loyal to and protect each other. We must humbly admit when we are wrong, be sympathetic and compassionate to others when they fall, and above all, love faithfully.
This is how we love as brothers. And this is our calling.
Do not repay evil with evil or insult with insult, but with blessing, because to this you were called so that you may inherit a blessing. (1 Peter 3:9)