All these things that I have done

I think I'd contrast this with the principle First do no harm (http://en.wikipedia.org/wiki/Primum_non_nocere), which wikipedia informs is not in fact from the Hippocratic Oath as I had thought, but is a fundamental of medical ethics. If the truth would be harmful, I'd say that could override the general principle that lying is wrong (and, indeed, the more specific principle that lying to your patient is wrong).