This is not a story (Weasel juice)

Think not you can arrive at your destination by going in the opposite direction

Beware the man with a thought. He sits there; even on a bus! with a thought in his head. And when he climbs off it hasn't been dislodged. But the agony writ in his eyes plainly transparent to any with the misfortune to happen with him to lock looks. They are lucky if they escape with none of his tortured pain transferred unto themselves, and damned to confusion if they perceive his madness, and, as a hypnotised snake, perceive it not as such. The baker's nephew, for example, he must remain careful, as must we all. Beware the man with a thought in his head! And keep yours very clean.