Courage is the ability to confront fear, pain, risk/danger, uncertainty or intimidation.
Courage is going from failure to failure without loosing enthusiasm.
Physical courage is courage in the face of pain, hardship or threat to life
Moral courage is the ability to act rightly in the face of popular opposition, shame, scandal or discouragement.

The definitions above suggest that courage is the ability to bring oneself to take action in spite of fear. Courage is knowing how, why, where, and to whom to say, "Yes" or "No". Courage is derives from the Latin word Cor, which means "heart". Courage demands applying the uniquely human art of your brain (the neocortex) to wrest control away from the emotional Limbic brain you share to live up above other common mammal and become more human.

Lack of courage is one of the major course of failure moreover experience with thousand of people has proved that lack of courage is a weakness common to the majority of men. The starting point of all achievement is courage. In brief, Clare booth L. affirms that, "courage is the Ladder on which all other virtues mount".

Courageous people are still afraid, but they don’t let the fear paralyze them from taking action. But the non courageous people are prone to fear more often and more often they fail to succeed because the fear will always forestalls them.

The conscience is a sterner prison; it will continue to recall the deed that you did not do well, the risk, which you would have outstanding relationship, to learn new skill to impact positively toward human development. Still this voice of your conscience tells you would have become the next bill gate if not that you were afraid. If will continue nagging you about your mediocre results until you die.