Carl Icahn. REUTERS/Chip East Carl Icahn warned federal stimulus is fueling inflation and will eventually cause a market crisis. The activist investor hasn't bought bitcoin because he doesn't understand it. Icahn said he wasn't annoyed about losing out on $40 billion by selling Apple and Netflix stock. Carl Icahn trumpeted activist investing, sounded the alarm on federal spending, and explained why he doesn't own bitcoin in a CNBC interview this week.The billionaire boss of Icahn Enterprises also advised against making market predictions, warned of a looming inflationary crisis, and reacted to Insider's recent report that he left more than $40 billion on the table by selling Apple and Netflix stock.Here are Icahn's 7 best quotes from the interview, lightly edited and condensed for clarity:1.