There will always be a time where you will have to complete a task, delegated to you by your boss, that you are not fully motivated to complete. Your lack of motivation could be for many reasons; lack of involvement, lack of underst anding, lack of interest, etc. However, this does not mean that you will not do it, or that it will be done to any less of a quality…but you do need to find a way to motivate yourself, and your manager needs to find a way to positively motivate you too.
If your manager knows you well enough, he or she will know what tasks you like and dislike. The manager can then take advantage of the mother principle/rule.