In the study of Chinese Metaphysics, the ancient sages believed the universe is made up of a triumvirate of Heaven, Earth and Man, known as the Cosmic Trinity.
Heaven, Earth, Man controls or exerts and influence equivalent to 33%. The fortunes are set by Heaven, the environment or Feng Shui magnifies our fortunes or luck, but Man's own action or inaction is what makes an outcome swing one way or the other.
Hence, a person with limited capacity may have many achievements thanks to his hard work and positive thinking attitude, while a person with the capacity to do great things may squander his potential by choosing to sleep all day at home.