The single greatest threat – and the single greatest obstacle – to your performance is you. It isn’t someone or something else. It isn’t your boss, your manager or your supervisor. Your clients may be difficult, too, but they’re not the problem. And your competitors have next to nothing to do with your results or your success; in the big scheme of things, they have no impact. There’s no benefit to believing that external factors and events can harm you when it comes to your personal and professional success.
Most of these things have little to no impact. None of these things have near the impact of the decisions you make and the actions you take to make your goals a reality. No one can harm you as much as you can harm you.