Principles and the search for moral certainty.

In medical ethics, principles have an important but frequently overextended role. The need for exact answers and moral formulae sometimes leads to the misuse of principles, such that they usurp the central place of persons and become ends in themselves. The Baby Jane Doe case is discussed as a prominent instance of both the proper uses and abuses of principles. A more fitting role for principles is described and illustrated, stressing the use of principles as tools of moral discernment and the time-laden character of moral judgments.