Why patience a virtue?

From WikiAnwers:

Patience is a virtue because it makes us better people. The definition of the word is to tolerate delay. This implies self control and forebearance as opposed to wanting what we want when we want it. How many times have we jumped the gun and found out it it would have been better to tolerate delay or had self control? What did we miss out on? Did we hurt someone because of lack of patience? Did our lives just change completely just because we couldn't control ourselves? Patience is not only a virtue but a necessity for a happy existence.

I've been holding my patience waiting for our new car since last month. I didn't get enough sleep and can't concentrate to other things.
When me and my husband decided to get the car, we were promised that we'll get the car in about 2 weeks. We were promised that we should get the car the week before Aidilfitri. Then, I have to control my anxiety not to dream too much while waiting for the bank to approve our loans. Finally after we signed the loan agreement I couldn't sleep waiting for the car. But the my heart crashed when we were told that there were problems with the car registrations with the Customs.
However I'm glad we still could go back to Perak for Aidlifitri using the company's test drive car. However we have been using the car for a few days after we came back here bit there's still no news about the registration process. Our car is already in the showroom and the plate number is ready. I just couldn't wait for us to get the car. It is very uncomfortable to use other people's car even though the temporary car is in very good condition. I just hope all process will be completed very soon so we can use our own car as soon as possible. I sure hope the car is worth waiting for. Just like the quote I saw the other day, "Once a Streamer, Always a Streamer."