Sentence:  This is not the sort of happiness which a man would in general wish to owe to his wife; but where other powers of entertainment are wanting, the true <WSD>philosopher</WSD> will derive benefit from such as are given. 
Meaning of the word marked with <WSD> tags:  A person who applies the principles of philosophy to the conduct of their life, as by acting calmly and rationally in the face of inevitable change.