Arrowsmith by Sinclair Lewis

There seemed to be no division between his Junior and Senior years. Because of the time he had lost, he had to remain in Mohalis all summer. The year and a half from his marriage to his graduation was one whirling bewilderment, without seasons or dates.

When he had, as they put it, "cut out his nonsense and buckled down to work," he had won the admiration of Dr. Silva and all the Good Students, especially Angus Duer and the Reverend Ira Hinkley. Martin had always announced that he did not care for their approbation, for the applause of commonplace drudges, but now that he had it, he prized it. However much he scoffed, he was gratified when he was treated as a peer by Angus, who spent the summer as extern in the Zenith General Hospital, and who already had the unapproachable dignity of a successful young surgeon.