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I mean that I think I find the psychology of people more interesting than politics. I think the psychology of politics is more interesting than straight politics.

Political ideology can corrupt the mind, and science.

Politics has high and low moments. Sometimes it brings out the better angels of our nature; sometimes baser instincts.

Ethics, politics and psychology are all far more difficult to understand now that we know the depths to which human nature can sink.

I believe that politics takes a much different set of skills than science. Science is about getting to the truth. Politics is about what people think and how they react.

Everyone thinks politics will just go on the way it is. I don't agree.

It's my belief that, since the end of the Second World War, psychology has moved too far away from its original roots, which were to make the lives of all people more fulfilling and productive, and too much toward the important, but not all-important, area of curing mental illness.

Psychology is the only necessary skill for running for president. Trump knows psychology.

Policy makers, like most people, normally feel that they already know all the psychology and all the sociology they are likely to need for their decisions. I don't think they are right, but that's the way it is.