Sentence:  When I imagin man fraughted with al the commodities may be wiſhed; ... I finde him to ſinke vnder the burthen of his eaſe, and perceive him altogether vnable to beare ſo pure, ſo conſtant, and ſo vniverſall a ſenſualitie. Truely he flies when he is even vpon the <WSD>nicke</WSD>, and naturally haſtneth to eſcape it, as from [a] ſtep whereon he cannot ſtay or containe himſelfe, and feareth to ſinke into it. 
Meaning of the word marked with <WSD> tags:  A particular place or point considered as marked by a nick; the exact point or critical moment.