A life without adventure is likely to be unsatisfying, but a life in which adventure is allowed to take whatever form it will is sure to be short.

Bertrand Russell (1872-1970) English mathematician and philosopher

Authority and the Individual, Lecture 1 (1949)
    (Source)

Collection, with some edits, of the inaugural Reith Lectures, BBC, "Authority and the Individual," No. 1 "Social Cohesion and Human Nature" (25:36) (1948-12-26).