Sentence:  For two reasons then it is right to be content with that which happens to thee; the one, because it was done for thee and prescribed for thee, and in a manner had reference to thee, originally from the most ancient causes spun with thy destiny; and the other, because even that which comes severally to every man is to the power which administers the universe a cause of <WSD>felicity</WSD> and perfection, nay even of its very continuance. 
Meaning of the word marked with <WSD> tags:  Happiness.