Sentence:  They do not always find manors, got by rapine or <WSD>chicanery,</WSD> insensibly to melt away, as the poets will have it ; or that all gold glides, like thawing snow, from the thief's hand that grasps it. 
Meaning of the word marked with <WSD> tags:  Deception by use of trickery, quibbling, or subterfuge.