Sentence:  [T]ill he infect and poison that age, and spoil that time that he lives in by his <WSD>exemplary</WSD> sins, till he be "pestis secularis", the plague of that age, "peccator secularis", the proverbial sinner of that age, and so be a sinner of a hundred years, till in his actions he have been, or in his desires be, or in the foreknowledge of God would be a sinner of a hundred years, an inveterate, an incorrigible, an everlasting sinner, yet God comes not to curse him. 
Meaning of the word marked with <WSD> tags:  Providing an example or illustration.