If things are easy for us, then they are not lessons, but things we already know.
[Attributing the origin of life to spontaneous generation. ] However improbable we regard this event, it will almost certainly happen at least once. . . . The time. . . is of the order of two billion years. . . . Given so much time, the "impossible" becomes possible, the possible probable, and the probable virtually certain. One only has to wait: time itself performs the miracles.