The phrase 'a secret purpose' is correct and usable in written English.
It can refer to something that someone has a hidden intention or motive for doing or achieving. For example, "He had a secret purpose behind his latest business venture that only he knew."
The alternative, of course, is that depression has a secret purpose and our medical interventions are making a bad situation even worse.
"Because if life is so critical, if Anne Frank could die, if my friend could die, children were as vulnerable as adults, and that gave me a secret purpose to my work, to make them live.
Like most other things in the Dark Souls universe, even the message system has a secret purpose.
I'm having lunch with a friend from college days, Michael, with the secret purpose of asking him a favor.
I could not quite see what he was getting at, unless it was that I had some secret purpose for having done a long-standing friend a good turn.By the time he left, I was a shade perturbed.
They are a mix of old friends, siblings, spouses and one new outsider, and the secret purpose of the reunion is so that Annie (Lynskey) and Jessie (DuVall) can stage a "marriage intervention" on Ruby (Smulders).
If only a few African countries were to sign up to deals like this, there could be a big rise in deportations from Europe.The circularity motionIndeed, is this the secret purpose of the whole project?
Here we can observe, in action, another secret purpose of the critic: to entertain.
All the while that Fitzgerald was serving the studios, he was simultaneously serving his own distinctly secret purpose and project.
Or it can be the mystery behind a whole book, which may depict all sorts of thoughts in the central character's consciousness – except his secret purpose, withheld until the end.
The secret purpose which the government have assigned to them is not revealed with the flash of drama, horror, or vertigo that it might have in conventional sci-fi treatments.
