The unpredictability inherent in human affairs is due largely to the fact that the by-products of a human process are more fateful than the product.
Eric Hoffer (1902-1983) American philosopher and author.
No one can possibly know what is about to happen: it is happening, each time, for the first time, for the only time.
James Baldwin (1924-1987) African-American writer.
He who asks fortune-tellers the future unwittingly forfeits an inner intimation of coming events that is a thousand times more exact than anything they may say. He is impelled by inertia, rather than curiosity, and nothing is more unlike the submissive apathy with which he hears his fate revealed than the alert dexterity with which the man of courage lays hands on the future.
Walter Benjamin (1892-1940) German philosopher.
Prediction is very difficult, especially about the future.
Niels Bohr (1885-1962) Danish physicist.