"In certain extreme cases, medication may be necessary. But it is given far too often, too easily, and too readily. Millions of children already are on tranquilizers, for example, and that is absurd."

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Nearly everybody nowadays accepts the 'causal completeness of physics' - every physical event (or at least its probability) has a full physical cause. This leaves no room for non-physical things to make a causal difference to physical effects. But it would be absurd to deny that thoughts and feelings (and population movements and economic depressions . . .) cause physical effects. So they must be physical things.

— David Papineau