Further, in our language we have a distinction between "thinking" and "thought." "Thinking" implies the present tense—some activity going on which may include critical sensitivity to what can go wrong. Also there may be new ideas, and perhaps occasionally perception of some kind inside. "Thought" is the past participle of that. We have the idea that after we have been thinking something it just evaporates. but thinking doesn't disappear. It goes somehow into the brain and leaves something—a trace—which becomes thought. And thought then acts automatically. So thought is the response from memory—from the past, from what has been done. Thus we have thinking and thought.