Books recommended by Albert Einstein

“Throughout his life Einstein was a man of the book, to a much higher degree than other scientists. The remarkably diverse collection of volumes in his library grew constantly. If we look only at the German-language books published before 1910 that survived Einstein’s Princeton household, the list includes much of the cannon of the time: Boltzmann, Buchner, Friedrich Hebbel, the works of Heine in two editions, Helmholtz, von Humboldt, the many books of Kant, Gotthold Lessing, Mach, Nietzsche, and Schopenhauer. But what looms largest are the collected works of Johann von Goethe in a thirty-six volume edition and another of twelve volumes, plus two volumes on his Optics, the exchange of letters between Goethe and Schiller, and a separate volume of Faust.”
Galison, Peter, Holton, Gerald J., and Schweber, Silvan S. (2008). Einstein for the 21st Century: His Legacy in Science, Art, and Modern Culture (ch. 1: Who Was Einstein? Why is He Still so Alive?, pgs 3-15; quote: pg. 10). Princeton University Press.