Lack of capability

The potential of a person to accomplish a task is directly related to his experience.

More the number of years of experience he has; more capable he will be.

For instance, if an employee is working in a factory from a long time and he can now complete his task in less time; then it is his experience which has made this possible.

However, if he would have shown disinterest and neglect towards improving his performance; then his capability would have been of no use.

So, always show some readiness and preparedness to improve your efficiency to succeed in life.