This book paints vivid portraits of an assortment of inspiring thinkers: from Lao Tzu to Avicenna to Iris Murdoch; from Hannah Arendt to Socrates and Plato to Karl Marx; from Kierkegaard and Nietzsche to Sartre to Samuel Beckett – and let us not forget Lewis Carroll for some thought-provoking fantasies and Ludwig Wittgenstein for the anguishes of a genius. As well as displaying optimists and pessimists, believers and non-believers, the book displays relevance to current affairs, from free speech to abortion to the treatment of animals to our leaders' moral character.