One day had Zarathustra fallen asleep under a fig-tree, owing to the heat, with his arms over his face. And there came an adder and bit him in the neck, so that Zarathustra screamed with pain. When he had taken his arm from his face he looked at the serpent; and then did it recognise the eyes of Zarathustra, wriggled awkwardly, and tried to get away. “Not at all,” said Zarathustra, “as yet hast thou not received my thanks! Thou hast awakened me in time; my journey is yet long.” “Thy journey is short,” said the adder sadly; “my poison is fatal.” Zarathustra smiled. “When did ever a dragon die of a serpent`s poison?”—said he. “But take thy poison back! Thou art not rich enough to present it to me.” Then fell the adder again on his neck, and licked his wound.
— Thus Spake Zarathustra, Friedrich Nietzsche