Every great new truth compels,
sooner or later, a readjustment of the
whole body of organised truth as men
hold it. The fresh thought about the
physical constitution of man bears its
fruit ultimately in some fresh notion
of his spiritual constitution; the new
fact in geology does not spend its
force until it has wrought a modifica-
tion of the view of the creative method
and the age of man in the world; the
fresh conception of the method of
evolution along material and physical
lines slowly reconstructs the philos-
ophy of mental and spiritual develop-
ment. Every new thought relates
itself finally to all thought, and is
like the forward step which continu-
ally changes the horizon about the
traveller.

The history of man is the story of
the ideas he has entertained and ac-

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v?