The speculative philosopher and the scientific specialist are liable to two opposite mistakes. The former tends to deliver frontal attacks on Reality as a whole, armed only with a few wide general principles, and to neglect to isolate and master in detail particular problems. The latter tends to forget that he has violently abstracted one part or one aspect of Reality from the rest, and to imagine that the success which this abstraction has given him within a limited field justifies him in taking the principles which hold therein as the whole truth about the whole world. The one cannot see the trees for the wood, and the other cannot see the wood for the trees. The result of both kinds of mistake is the same, viz., to produce philosophical theories which may be self-consistent but which must be described as "silly". By a "silly" theory I mean one which may be held at the time when one is talking or writing professionally, but which only an inmate of a lunatic asylum would think of carrying into daily life.
Source: The Mind and its Place in Nature by C.D Broad
Contributed by: Ernest