His father was pleased with the decision.  His course at Marlborough College was completed, and he immediately took special work preparatory to entering London Hospital and University.

In the University he did well.  He passed his examinations creditably at the College of Physicians and Surgeons and at London University, and had time to take a most active part in the University athletics as a member of various ’Varsity teams.  At one time or another he was secretary of the cricket, football and rowing clubs, and he took part in several famous championship games, and during one term that he was in residence at Oxford University he played on the University football team.

One evening in 1885 Grenfell, largely through curiosity, dropped into a tent where evangelistic meetings were in progress.  The evangelists conducting the meeting happened to be the then famous D.L.  Moody and Ira D. Sankey.  Both Mr. Moody and Mr. Sankey were men of marvelous power and magnetism.  Moody was big, wholesome and practical.  He preached a religion of smiles and happiness and helpfulness.  He lived what he preached.  There was no humbug or hypocrisy in him.  Sankey never had a peer as a leader of mass singing.

Moody was announcing a hymn when Grenfell entered.  Sankey, in his illimitable style, struck up the music.  In a moment the vast audience was singing as Grenfell had never heard an audience sing before.  After the hymn Moody spoke.  Grenfell told me once that that sermon changed his whole outlook upon life.  He realized that he was a Christian in name only and not in fact.  His religious life was a fraud.

There and then he determined that he must be either an out and out Christian or honestly renounce Christianity.  With his home training and teachings he could not do the latter.  He decided upon a Christian life.  He would do nothing as a doctor that he could not do with a clear conscience as a Christian gentleman.  This he also decided:  a man’s religion is something for him to be proud of and any one ashamed to acknowledge the faith of his fathers is a moral coward, and a moral coward is more contemptible than a physical coward.  He also was convinced that a boy or man afraid or ashamed to acknowledge his religious belief could only be a mental weakling.

It was characteristic of Grenfell that whatever he attempted to do he did with courage and enthusiasm.  He never was a slacker.  The hospital to which he was attached was situated in the centre of the worst slums of London.  It occurred to him that he might help the boys, and he secured a room, fitted it up as a gymnasium, and established a sort of boys’ club, where on Sundays he held a Bible study class and where he gave the boys physical work on Saturdays.  There was no Y.M.C.A. in England at that time where they could enjoy these privileges.  In the beginning, there were young thugs who attempted to make trouble.  He simply pitched them out, and in the end they were glad enough to return and behave themselves.