"Lord, there are many whom you can send to the gentiles - the impoverished of the earth; but send me!
There are myriads of celestial spirits who wait to do your bidding; but send me! I am slower in hand and feebler in heart than they, yet send me!
Send me because I am slower in hand and feebler in heart! It is not your holy angels that need to be trained in the joys of paradise; it is I. 
Shall I receive no message in the language of heaven- the language of sympathy! Shall all your messages of mercy be carried by Gabriel and Michael, and none by me! If by every couch of pain I beheld your ministering angel, I would never learn the science of sympathy." George Matheson.