Confidence

"Self-confidence is the first requisite to great undertakings." -Samuel Johnson

Nothing significant occurs in your life without confidence. Even the most insignificant and mundane tasks of your daily life require an unconscious confidence to do them. To accomplish new tasks and goals, you must first "know" that they are possible. There would be no reason to make plans or put them into action unless you first convinced yourself that those plans would guide you to your goals. Without that conviction, you might be tempted to stop, if the journey to your goal doesn't go as planned.
Have confidence in your ability to reach a goal. Your confidence will drive and motivate you to work hard, even though the challenges are great.