To understand that, we have to first understand what impatience is. According to Dictionary.com, impatience means a lack of patience; restlessness; an intolerance of anything that thwarts, delays, or hinders.
An impatient person never wants to wait for others, or does so with great reluctance. An impatient person feels angsty when things do not go to plan. An impatient person usually feels a great sense of urgency to get things over with and to move on to the next thing, the next task, the next place, the next stop. He/she usually has little regard or interest to what’s going on at this moment in time, because in his/her mind, he/she is already thinking about what he/she has to do next.
As you can see, the impatient person is someone who often feels a great deal of urgency, internal pressure, and internal stress. It’s as if he/she is trying to rush to somewhere, or has something that needs to be completed ASAP.