Here is a “key” to success quoted in the Brihasdaranyaka Upanishad and explained by Sri Eknath Easwaran. It is short and simple to state but needs steady efforts to apply.
You are what your deep, driving desire is.
– BRIHADARANYAKA UPANISHAD
Desire is the key to life, because desire is power. The deeper the desire, the more power it contains.
Most people start life with many small desires. Their power and vitality trickle away in many different directions. None of their desires is deep enough to contain much power. But there are people whose lives are molded by only a few, consuming desires. Such people usually achieve their goals. Because their desires are unified, their will becomes nearly invincible. To desire something deeply is to will it, and to will is to achieve. If they want to become a great artist, build a bigger pyramid, explain the movements of the planets, they devote their life to that, and usually succeed. Wherever you find great success in life, it is fueled by the intense unification of desires.
But the most successful people of all are the rare men and women like Mahatma Gandhi and Saint Teresa of Avila who have but one desire. All lesser desires have been consumed in the great fire of love for God.