Why does the Bible teach that Christians should be known by their love for one another?

Christians are sometimes called disciples or followers of Jesus. 

The Bible teaches that if people watch Jesus’ disciples carefully they will see that they are loving towards each other and when people see that, they will know that they are Jesus’ followers.

 
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But why are disciples loving towards each other?

A disciple is someone who, with the powerful help of the Holy Spirit, is learning and growing to be more like Jesus - because Jesus is loving, his disciples will learn and grow to be loving too.