The title ‘thinking’ is not reserved for the labours of trying to decide things. I am thinking if I am going over, in my head, the fortunes of the heroine of a novel that I have been reading; or if I am re-savouring a well turned argument, though I have long since accepted its conclusion. Or if I am drifting in idle reverie from one topic to another. Only some thinking is excogitation; only some thinking is work; only some thinking has a topic or a problem.

Gilbert Ryle, “Thinking and Language,” Collected Essays, 1929-1968 (1971)