My own path over the past two decades – prompted in reaction to my experience with him – has been to help business leaders become more wholly human, … - Tony Schwartz

Because the office Trump now occupies makes him the most powerful man on Earth, his fears, and the way he manages them, have necessarily become ours. We fear Trump because he is impulsive, irrational and self-serving, but above all because he seems unconstrained by even the faintest hint of conscience. Trump feels no more shame over his most destructive behaviours than a male lion does killing the cubs of his predecessor when he takes over a pride. Trump has made fear the dominant emotion of our times.

Trump’s temperament and his habits have hardened with age. He was always cartoonish, but compared with the man for whom I wrote The Art of the Deal 30 years ago, he is significantly angrier today: more reactive, deceitful, distracted, vindictive, impulsive and, above all, self-absorbed – assuming the last is possible.

Whatever happens, may the worst of Trump inspire the best in us.