Oswald Spengler (1880-1936), The Hour of Decision
, Part One: Germany and World-Historical Evolution
, tr. Charles Francis Atkinson (London: George Allen and Unwin Ltd., 1934), p. 151, n. 1:
This intellectual work can never be limited to a definite number of
hours. It pursues and tyrannizes over its victims during their periods of rest,
on their travels, and in their sleepless nights.
It makes a real rest from
thought and real relaxation impossible and uses up the most able men
the time. No worker for wages breaks down from overstrain or mental
collapse. But among these others it happens in innumerable cases. So much
for the demagogues' picture of the gourmandizing, idle bourgeois!