Spinoza left a celebrated description of his life's endeavour: After experience had taught me that all things which frequently take place in ordinary life are vain and futile; when I saw that all the things I feared and which feared me had nothing good or bad in them save in so far as the mind was affected by them, I determined at last to inquire whether there might be anything which might be truly good and able to communicate its goodness, and by which the mind might be affected to the exclusion of all other things: I determined, I say, to inquire whether I might discover and acquire the faculty of enjoying throughout eternity continual supreme happiness. (