The author of the passage asserts that the weather and a knife are similar because:
F. Both are defined as good if and only if they can be helpful to many people for a variety of reasons.
G. Neither can be defined as good unless they remain consistent and unchanged in the wake of fluctuating circumstances.
H. Both are defined as good when their characteristics serve appropriate external circumstances.
J. Neither one can be good unless a universal definition of the concept is accepted.