As a professional personal statement editor, my advice to you is two-fold:
First, I advise you not to force you statement to be everything. If you attempt to emphasize too many disparate qualities, you will dull and dilute the unique and strong parts.
Secondly, I challenge you not to be vague. What does " humanistic desire to go into medicine" even mean? This is fluff -- you are relying on a buzzword to vaguely imply that you have the altruistic qualities that are necessary for a career in medicine. If you said, "my guiding principle is empathy for difficult social situations that prevent access to regular medical care for underprivileged patients," or "I possess the fortitude that will help me remain a caring and empathetic physician in the face of difficult and non-adherent patients," then I might be more impressed by your "humanistic desire to go into medicine."
Best of luck!