Ephesians 4

2 Be completely humble and gentle; be patient, bearing with one another in love.
As God's salvation applies to people from all races, class and gender it is impossible to have agreement on everything theological, social and political. Some Christians have even hurt each other whether it be before or after they met Christ. If we are to be separate from the world then we shouldn't be surprised to leave behind the wrongdoings done to us and be patient with the faults in others. This means if i struggle to get along with a fellow Christian or unbeliever, rather than developing a sense of bitterness towards them I should pray them and acknowledge the flaws in myself.