With Gen Z facing an uphill battle in today’s job market, landing the right role—or even starting your own entrepreneurial venture—can feel overwhelming.

But instead of following the age-old advice of chasing your passions, it might be smarter to center yourself on one thing that you can’t get enough of. It’s advice that Shark Tank star Robert Herjavec said he learned from his former co-star, billionaire investor Mark Cuban.

“Life doesn’t care about your passion, and I don’t care about your passion,” Herjavec recalled Cuban saying during a show taping one season.

“I don’t care that you love golf or basketball or AI or cyber, I don’t give a shit about any of that. What I want to know is, what are you obsessed with?” Herjavec added to Fortune. “Passion is easy, because passion is a wish, but obsession is an action. Passion doesn’t demand anything of you. Obsession requires everything of you.”

For Herjavec, that lesson was personal. Early in his career, he wasn’t sure what path to take—he considered everything from becoming an FBI detective to working in film. But once he discovered cybersecurity, he found himself thinking about it constantly.