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Three Statements
(1961)
Conciliating East and West
(1962)
A Matter of Life
(1963)
In Praise of Idleness
(1965)
Elogio de la ociosidad
(1968)
Elogio della pigrizia
(1971)
Philosophic Doubts
(1972)
Why I Am Not a Christian
(1972)