Ajith Fernando in Jesus Driven Ministry (p21) gives an indication:

 “The whole life of Christ was a paradox propelled by the need to redeem sinful humanity. he took on burdens that he didn’t have to take on, and he gave up things that were his legitimate right. And shortly before he left the world, he told his disciples, “As the Father has sent me so I am sending you” (John 20:21). So his mission becomes our mission. At the Last Supper he told his disciples that they must give their lives for others as he did (Jn 15:12-13.) Then he went on to say that their willingness to give their lives for others showed that they were his friends.”

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