Sentence:  When the ſoule bringeth its fire deſire out of its owne ſelfe-will into the Love-deſire of God; and goeth out of its owne ſelfneſſe, and ſinketh into the mercy and compaſſion of God, and caſteth it ſelfe into the death of Chriſt; and willeth no longer the fire-ſource, but deſireth in its fire-life to be dead in the death of Chriſt; then the poyſon of the <WSD>"Mercuriall</WSD>" life dyeth in the will of iniquity, and there ariſeth a new twigge, and budding of love-deſire. 
Meaning of the word marked with <WSD> tags:  Having a lively or volatile character; animated, changeable, quick-witted. (from 17th c.)