Sentence:  Just as money is the <WSD>province</WSD> of the economy and truth the <WSD>province</WSD> of science and scholarship, so love is the <WSD>province</WSD> of the family (Niklas Luhmann). 
Meaning of the word marked with <WSD> tags:  An area of activity, responsibility or knowledge; the proper concern of a particular person or concept. (from 17th c.)