It was his subconscious which told him this — that infuriating part of a person’s brain which never responds to interrogation, merely gives little meaningful nudges and then sits humming quietly to itself, saying nothing.

Douglas Adams (1952-2001) English author, humorist, screenwriter

Dirk Gently No. 2, The Long Dark Tea-Time of the Soul, ch. 17 (1988)
    (Source)