have bound myself by so strict an obligation; but as a rule professional secrets will continue to be binding even when the observance of them entails serious loss.
3. We are bound to make known natural and promised secrets at the command of lawful superiors. The obligation of obedience to lawful authority prevails over that of secrecy due to individuals in those cases. And so a witness in a court of justice when lawfully questioned about what he knows under the obligation of natural or promised secrecy must give the evidence required. Similarly, secret impediments to marriage must be declared according to the precept contained in the proclamation of banns. Professional secrets, however, and, in general, secrets which belong to the third class, are privileged, and must not be declared, unless they have ceased to be binding for some such reason as those mentioned above. Secrecy in this case is demanded by the natural law, which gives the fullest possible security to those who consult others in their difficulties, and even the precept of one's superior cannot avail against the natural law, as St Thomas teaches. [1]
English law acknowledges the privilege of state secrets and of the professional secrets of lawyers, but in the case of doctors and clergymen it does not as yet go the full length of the doctrine laid down above.
4. The doctrine with regard to secrets is applicable to the opening and reading of letters, unless it is known that they contain no secrets and the writer is not aggrieved. It is, however, a general rule of Religious Orders that letters written by and to religious may be opened by the superior, except such as contain matters of conscience, and communications between higher superiors and their subjects.
- ↑ Summa, 2-2, q. 70, a. i, ad 2.
