Ferrari is a personal matter, President John Elkann said Thursday stressing that he is showing total commitment to reviving its fortunes amid another disastrous season in Formula One.     "Let me be clear: this is a personal matter for me. I am committed as president, as majority shareholder, and above all in the name of a lifelong passion: my passion for Ferrari." Chairman Elkann reiterated at the opening of Capital Markets Day.     Stellantis and Exxor President Elkann spoke of "commitment to