Chapter V. Secrets

A SECRET is some hidden matter concerning another which cannot be made known without causing him injury or displeasure. Besides the secret of the seal of confession, which is treated of elsewhere, divines distinguish three kinds of secret: the natural secret, the promised secret, and the secret which is communicated under an express or implied contract of secrecy.

When we come to the knowledge of something concerning another which cannot be made known without causing him injury or displeasure we are under the obligation of a natural secret not to make it known. This obligation arises from charity and justice, inasmuch as these virtues forbid us to do anything to the hurt or annoyance of our neighbour.

If we come to know something concerning our neighbour and then give a promise not to reveal it to others, we are bound by a promised secret. If the matter was of its nature secret, there would be the obligation of a natural secret independently of the promise. When the promise is given, a special obligation arising therefrom binds the party to secrecy. In case the matter was not of itself secret, the only obligation would be that arising from the promise. It depends to some extent on the intention of the promisor as to.what obligation he takes upon himself by his promise. He may intend to bind himself to keep his word by the virtue of fidelity, because it is the duty of an honest man to keep his promise. In this case, as fidelity only binds under pain of venial sin, there will only be this obligation to observe the promised secret. However, if the other party to whom secrecy was promised would suffer serious loss from the violation of the secret, or if the parties were bound by mutual promises, then justice would require the secret to be kept, and the violation of the obligation would of itself be gravely sinful. Apart even from these circumstances, the promisor may intend to give the other a right to secrecy in justice, and then he will be bound to observe it under pain of mortal sin, A secret which is confided to another under the condition that secrecy is to be observed constitutes the matter of an onerous contract and binds more strictly than either a natural or a promised secret. Such are secrets of office which officials of all sorts become aware of in the execution of the duties entrusted to them; professional secrets of doctors, lawyers, priests, and others, who are consulted as experts by people in doubt or difficulty; as well as all others which are entrusted to any person under the express or implied condition of secrecy.

The obligation to observe a natural secret will cease after the secret has become public property. The party whose secret it is may sometimes be reasonably presumed not to be unwilling that the matter should be communicated to another, as, for example, to somebody who can and who will be of assistance to him. If the public good requires that the secret should be made known in order to prevent public wrong, the obligation of secrecy will cease, for the public welfare is of greater importance than that of an individual. If serious harm threatens one’s self or some other innocent person, or the party whose secret is in question, and the harm can only be averted by making known the secret, this will be allowed in the case of natural or promised secrets. The right of defence from impending evil prevails over that of natural and promised secrets.

Even the obligation of the third class of secrets will cease when they cannot be observed without serious harm to the public weal. The natural law, however, which requires that people should be able to consult others in their difficulties in all security, demands that this class of secret should be observed in the case when even serious harm threatens some innocent person, unless he whose secret is in question is the cause of the impending evil. Thus, if I know as a professional secret who is the real culprit in the case of a crime wrongly imputed to an innocent person, I may disclose the real culprit if by some special means he caused the false accusation of the innocent person, otherwise I must keep the secret. ‘It is a disputed point among theologians whether I am bound to observe a secret at the peril of my life when it was entrusted to me under that express condition, some maintaining that no one can pledge his life in that way, others more probably holding the contrary. ’Whether or not I am bound at my own serious loss to keep a secret entrusted to me under the condition of secrecy depends to some extent on circumstances, Sometimes I cannot be supposed under the circumstances to 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.

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.

¹ Summa, 2-2, q. 70, a. I, ad 2.

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.