Change is the principle--and the process--that enables us to move on and upward growth and

change, of continuous improvement. To make meaningful progress, we need to consider one other aspect of change as it is used only by human our thought. In the words of Madame, "The voice of thought is so soft that it is easy to forget about it, but it is also so clear that it is impossible to misunderstand it."

Just as the education of nerve is most important to the excellent athlete and education of the mind is vital to the scholar, education of the thought is vital to the truly highly effective person.

Training and educating the thought, however, requires even greater concentration, more balanced discipline, more consistently honest living. It requires regular feasting on inspiring literature, thinking noble thoughts and, above all, living in harmony with its still small voice.

Just as junk food and lack of exercise can ruin an athlete's condition, those things that are not decent, crude, or unhealthy can lead to an inner darkness and make us wonder "What is right and wrong？"

In the words of Dag Hammarskjold, You cannot play with the animal in you without becoming wholly animal, play with falsehood without losing your right to truth, play with cruelty without losing your sensitivity of mind. He who wants to keep his garden tidy doesn't reserve a plot for weeds.

Once we are self-aware, we must choose purposes and principles to live by; otherwise the hole will be filled, and we will lose our self-awareness and become like groveling animals that live mainly for survival.

And there is no easy way in developing them. The Law of the Harvest governs; we will always reap what we sow--no more, no less. I believe that as we grow and develop, an increasingly educated thought will push us along the path of personal freedom, security, wisdom, and power. Moving upward requires us to learn, commit, and do on increasingly higher planes. To keep progressing, we must learn, commit, and do--learn, commit, and do--and learn, commit, and do again.

What is the topic the author is trying to get to in paragraph 1？

A．Continuous improvement.

B．Upward growth and change.

C．Change of thought.

D．The voice of thought.