Yet we must not disguise the fact that in the social sciences in general the difficulties to be overcome are enormously greater. Not only does the greater complexity of psychological laws (or constant tendencies) that are common to all human groups make it harder to determine their operation, but it is easier to observe the things that go on about us than it is to observe the things we ourselves do. Man can much more easily study the phenomena of physics, chemistry or botany than he can his own instincts and his own passions.… But then, even granting that … individuals can attain scientific
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