Sentence:  If you happen to be a genius it will not necessarily be fatal to your inspiration if you succeed in winning the love of a <WSD>groundling</WSD>. Female <WSD>groundlings</WSD> often make excellent housekeepers; male <WSD>groundlings</WSD> good providers. But if your <WSD>groundling</WSD> is not of the pure type and should greatly admire your intellectual output, you will probably adapt your future production to the <WSD>groundling</WSD> understanding, and at that moment you begin to die at the top. 
Meaning of the word marked with <WSD> tags:  A person of uncultivated or uncultured taste.