In this book, I intended to paint an ethical portrait of a noble and lucid scientist par excellence. In doing so, I was primarily guided by what he said about himself, about others, about his endeavours as a researcher and about the general events and views on the world of his time. To some extent, I have also relied on quotations and articles of people whose names are mentioned in this volume: people who have devoted themselves to studying Tesla's life and who, by doing so, helped me present a full but concise and truthful image of Nikola Tesla's life and works. For that I am sincerely grateful.