steve jobs wozniakApple co-founders Steve Wozniak and Steve Jobs in the company’s early days.Kimberly White / REUTERS

Regardless of how we define it, success can feel like a fleeting and often elusive target.

It takes confidence, passion, and drive to reach a level of success and then do what’s necessary to sustain it.

We’ve collected wisdom from 14 prominent CEOs and entrepreneurs who have seen drastic ups and downs throughout their careers.

Their advice is as appropriate for someone just starting out as for an industry veteran.