Generally speaking, the way of the warrior is resolute acceptance of death.
-- Miyamoto Musashi
When a warrior goes to battle he must consider himself already dead in order to fulfill his mission. The idea is to not be preoccupied with preserving your life, thus focusing you on the goal at hand regardless whether it results in your death or not.
When caught in a thunderstorm you must consider yourself already wet. Your shoes, your clothes, your face will be drenched despite your best efforts. The sooner you accept that outside of a full boots-raincoat-plastic pants get up, any kind of rain wear will not stand up to buckets of water falling from the sky buffeted by winds, the easier it will be for you to negotiate a path through said winds.
The goal is to navigate. Aspiring to dryness at the destination is folly and may even prevent you from your goal.