If I shall exist eternally, how shall I exist tomorrow?
(Franz Kafka (1883-1924), Prague German Jewish author, novelist. The Third Notebook, January 18, 1918. The Blue Octavo Notebooks, ed. Max Brod, trans. by Ernst Kaiser and Eithne Wilkins. Exact Change, Cambridge, MA (1991). Dearest Father: Stories and Other Writings, trans. by Ernst Kaiser and Eithne Wilkins, New York, Schocken Books (1954).)
I have to live for the day, and not worry about or try to know what tomorrow brings.... if I've learned one thing from all that's happened to me, it's that if you would know what tomorrow brings, you may not want to live it.
(Monica Seles (b. 1973), Yugoslavian tennis player; relocated to America. As quoted in Tennis magazine, p. 44 (March 1994).
The former top-ranked woman singles tennis player in the world, she was reflecting on the experience of being stabbed a year earlier by Gunther Parche, a deranged fan of rival player Steffi Graf.)