Page 108.

In short,

Jesus did not heal people to prove he was God;

he healed them because he was  God.

page 156.

This seems to be one reason for the success of Kathryn Kuhlman's celebrated healing services:

In the miracle services a community of love and acceptance is created.  People feel secure enough to lay aside the barriers of fear, distrust, and egotism that have shut them off not only from fruitful contact with their fellowman but from their own deeper selves.  There is a yielding up of self-isolation.  The individual loses himself in the group, the smybol of the loving family where one is accepted in spite of his faults and sins.  He identifies with the needs of others.  He sometimes forgets his own illness, his own needs, in praying for someone else whose need is greater.  In his self-forgetfulness, as it happens, he is healed.