For the man sound in body and serene of mind there is no such thing as bad weather; every day has its beauty, and storms which whip the blood do but make it pulse more vigorously.

The sentence frames “bad weather” as a judgment that depends less on external conditions than on inner resources. If one is healthy (“sound in body”) and emotionally balanced (“serene of mind”), even discomforting conditions can be reinterpreted as invigorating rather than oppressive. The image of storms “whip[ping] the blood” suggests a bracing, almost athletic responsiveness to nature: adversity becomes stimulus, not injury. In this way the remark aligns with a stoic or self-mastery ethic—cultivating resilience so that circumstance cannot easily diminish one’s capacity for appreciation. It also implies an aesthetic stance toward the everyday: each day, even a stormy one, contains its own kind of beauty.