Conversation so far:
Did Pepys have a wife?
Pepys married fourteen-year-old Elisabeth de St Michel
Does Samuel Pepys have any children?
He had no children
What did Samuel Pepys do in his personal life?
He liked wine, plays, and the company of other people
Was Samuel Pepys a business man?
What was Samuel Pepys also?
Pepys was also a widely cultivated man, taking an interest in books, music, the theatre and science

Question: What was he passionately interested in?
Self-contained rewrite: What was Samuel Pepys passionately interested in?