Too many people go to work and have little or no pride in what they do. This may be because they are on such a low wage or that they are in a job that they did not want (such as a family run business).
If you can take pride in your work, it means your day will be more enjoyable and also your prospects improve for moving up the ladder. Employers like to have conscientious people working for them and if they see an employee who takes pride in what they do and goes the extra mile if required, then they are likely to consider you for a promotion.
Going the extra mile does not have to be a lot. It could be something as small as staying behind 10 minutes at the end of the day to take a phone call or going in on a Saturday on the odd occasion to organise your desk.