Nothing is more fluctuating and inconstant on many occasions, than the will of man
 David Hume, A Treatise of Human Nature (1738). copy citation

add
Author David Hume
Source A Treatise of Human Nature
Topic
Date 1738
Language English
Reference
Note
Weblink http://www.gutenberg.org/files/4705/4705-h/4705-h.htm

Context

“Now if we compare these two cases, that of a person, who has very strong motives of interest or safety to forbear any action, and that of another, who lies under no such obligation, we shall find, according to the philosophy explained in the foregoing book, that the only known difference betwixt them lies in this, that in the former case we conclude from past experience, that the person never will perform that action, and in the latter, that he possibly or probably will perform it. Nothing is more fluctuating and inconstant on many occasions, than the will of man; nor is there any thing but strong motives, which can give us an absolute certainty in pronouncing concerning any of his future actions. When we see a person free from these motives, we suppose a possibility either of his acting or forbearing;” source