Such are the words of the psychologist, DuBois-Reymond, in one of his
well-known lectures. The agnostic attitude is the most seemly that it is
possible to take. Nowadays, not only have all religious ideas been
upset, but so too has everything which until now appeared most solid,
most indivisible. Who has faith any longer in the atom? Who believes in
the soul as a monad? Who believes in the objective validity of the
senses?
The atom, unity of the spirit and of consciousness, the validity of
perception, all these are under suspicion today. _Ignoramus,
ignorabimus_.