I love this section from the very last page of Bonhoeffer's Ethics:

I have been thinking about the problem of talking about one's own fear (in air raids), a problem I wrote to you about quite recently. I believe that under the guise of "honesty" something is here presented as being "natural' which is really fundamentally a symtom of sin; it is really exactly like talking in public about sexual matters. The point is precisely that "truthfulness" soes not mean the disclosure of everything that exists. God Himself made clothes for man (Gen 3:21); and this means that in statu corruptionis many things in man are to remain concealed, and that if it is too late to eradicate evil, it is at least to be kept hidden. Exposure is cynical; and even if the cynic appears to himself be specially honest, or if he sets himself up to be a fanatical devotee of truth, he nevertheless fails to acheive the truth which is of decisive importance, namely, the truth that since the Fall there has been a need also for concealment and secrecy . . . In my view "telling the truth" means saying how something is in reality, i.e. respect for secrecy, confidence and concealment. "Betrayal", for example, is not truth; nor are frivolity, cynicism, etc. What is concealed must be disclosed only at confession, i.e., before God.