Precisely for the same reason that the majority of men in all countries
live more by feeling than by reason, and that the emotions, which are
inheritances, play a greater part in the individual life than the
reasoning faculties, which need training and experience for their
development and use,--so is the study of heredity of larger importance
in the study of emotional life. And therefore your suggestion that
one factor should not be dwelt on rather than others would be bad to
follow,--first, because all are not equal either in importance or
interest, and secondly because the circumstance related or studied must
be considered especially in relation to the principal factor of the
psychological state which that circumstance has evoked.