"He who would keep a secret must keep secret that he has a secret to keep" - Sir Humphrey Appleby but I think he was paraphrasing Goethe
That said, opsec is (to all practical intents and purposes) impossible in the long run in the face of a very determined adversary. If they want to find you, you will have done something to give someone a lead and there will be enough pieces to put the picture together.