You Are Not A Christian!?

Boice, commenting on Jesus' words about loving each other as evidence of being in Christ:

If people come up to us and cast in our teeth the judgment that we are not Christians because we have not shown love toward other Christians, we must understand that they are only exercising a prerogative that Jesus gave them. [He then quotes Schaeffer] 'And we must not get angry. If people say you do not love other Christians, we must go home, get down on our knees, and ask God whether or not they are right. And if they are, then they have a right to have said what they said.'