16. Confidence is your greatest asset.

You’ve heard it before: Running a marathon is far more mental than physical. A person’s ability to run a marathon—or do anything hard—is more a reflection of their level of confidence than their actual ability.

Your confidence determines:

• The size of challenges/goals you undertake
• How likely you will achieve those goals
• How well you bounce back from failures

If you’re not confident, you will never put yourself out there in the first place. When you’re confident, you don’t care how many times you fail, you’re going to succeed. And it doesn’t matter how stacked the odds seem against you.

17. Surround yourself with people who remind you of the future, not the past.

When you surround yourself with people who remind you of your past, you’ll have a hard time progressing. This is why we get stuck in certain roles, which we can’t break free from (e.g., the fat kid or shy guy).

Surrounding yourself with people who you want to be like allows you a fresh slate. You’re no longer defined by your past, only the future you are creating.

18. Let things go, but never forget.

Being unstoppable requires carrying no unnecessary mental or emotional baggage. Consequently, you’ll need to immediately and completely forgive anyone who has wronged you. However, forgiveness doesn’t mean you forget. And it doesn’t mean you have to do further business with those who have wronged you.

19. Have clear goals.

“While a fixation on results is certainly unhealthy, short-term goals can be useful developmental tools if they are balanced within a nurturing long-term philosophy.” — Josh Waitzkin

According to loads of psychology research, the most motivating goals are clearly defined and time-bound.

Related: 4 Tips for Setting Powerful Goals

Your goals can either be focused on your behaviors (e.g., I’m going to write 500 words per day) or on the outcomes you’re seeking (e.g., I’m going to get published on The New York Times by June 1, 2016).

For most people, behaviorally-focused goals are the better and more motivating option. But when you crave the results so much that the work is irrelevant, your aim should be directed straight at the outcomes you want. However, results-focused goals are better when short-term and grounded in your long-term vision and philosophy. When your why is strong enough, the how will take care of itself.

20. Respond immediately, rather than analyzing or stalling.

“He who hesitates is lost.” — Cato

Anticipation of an event is always more extreme than the event itself—both for positiveand negative events.

Just do it. Train yourself to respond immediately when you feel you should do something. Stop questioning yourself. Don’t analyze it. Don’t question if it came from God or from yourself. Just act.

You’ll figure out what to do after you’ve taken action. Until you take action, it will all be hypothetical. But once you act, it becomes practical.