"This Particular Key"

“The value of the individual’s story of Christ’s healing power lies largely in the undeniable fact that each human life stands at a unique point in the total web of human experience, and, as a consequence, each one has an approach to others which is not identical with the opportunity of any other human being. If I do not open the door for another, it may never be opened, for it is possible that I may be the only one who holds this particular key. The worker on the production line may have an entree to the life of his fellow worker on the line which can never be matched by any pastor or teacher or professional evangelist. The responsibility of each individual Christian is to do that which no other person can do as well as he can.” 

Elton Trueblood, The Company of the Committed