When you have a purpose of life, it grounds you.
It makes you focus on the things are essential and that you must do, in order to keep yourself sane and smiling.
And that purpose need not be just work. Maybe getting fit, becoming more peaceful, learning to let go, preparing for the marathon, getting your finances in shape; could also be some of the purposes.
What is dangerous is what happens after you have got a reasonable level of success in your purpose (or if the purpose never existed). Now you do not have anything to look forward to, you are making steady money, and there is no challenge forcing you to get out of your comfort zone.
So you wait for hours outside an Apple Store, on the day of the new iPhone launch.
I often pity those who do this, because real success, my friend, is knowing what to do with your time, even when you have all the money in the world. Or when you have no work to do some days, how you find real leisure beyond a device that asks you to stand in queues for hours.
Nothing in your world is going to change if you buy your iPhone 10 hours or 10 days later.
But only those who have the self-respect towards their time and their life have the courage to let go of the ego of “Hey, I got the iPhone on Day 1” can see that reality.