Secrets. Need to disguise. The novel was born of this.

Some secrets stayed secrets because nobody knew them. Some because nobody told.

Unfortunately, this category of secret is itself so secret that it's very existance is secret, and he can't actually reveal it to anyone.

One of the members indicated here that all this should have been done in secret. This was the intention; this never was supposed to be in the open. But in any case, the spies exposed it. We did not want to declare all this.

It didn't occur to me that my books would be widely read at all, and that enabled me to write anything I wanted to. And even once I realized that they were being read, I still wrote as if I were writing in secret. That's how one has to write anyway — in secret.

I'd learned that some things are best kept secret.

Culture hides more than it reveals, and strangely enough what it hides, it hides most effectively from its own participants.

Character lies more concealed, and out of the reach of common observation.

Something deeply hidden had to be behind things.

The Hidden Wisdom and Why It is Concealed

Even his Englishness was a well-kept secret.

... , years before he died, was hidden from most of us in the mist of his own method.

Some things were secret even after you told them.

Frequently, military expenditures are “secret” or concealed, thus frustrating the right of citizens to know how their taxes are being spent.