The following was the conclusion of an article I recently read on David Cheever in the Journal of Plastic and Reconstructive Surgery (referenced below). I would like to share it. I think it applies to whatever field you choose to study, not just medicine.
"Although we may remember David Cheever as a surgical innovator, his character is more aptly revealed in the following passage from a lecture, delivered before the Harvard Medical School class of 1871, entitled “How to Study Medicine”21:
If you seek for wealth you have mistaken your avocation. There must be something more, and something higher. That something is a love of your profession; a passion for science for its own sake; a broad humanity, which covers all the sick with a mantle of charity. Never lose sight of that motive, for if it once takes flight, your profession is reduced to a trade, and there is absolutely nothing left. As long as you can keep alive the sacred flame of this early passion which first called you to embrace the medical
profession, so long shall you be warmed, sustained, upheld amid disappointment, unjust treatment or reverses."
Cheever's Double Operation: The First Le Fort I Osteotomy; Plastic & Reconstructive Surgery. 121(4):1375-1381, April 2008; Halvorson, Eric G. M.D.; Mulliken, John B. M.D.