My business is a product of having to have a job and put food on the table.
I moved to Cornwall 1996 without a job and £2k of savings, we moved into rented accomodation which with living next to a pub slowly began to eat my savings.
Every time a bill dropped through the letter box, I used to dread it.
I didnt get a job for six months partly due to there being no jobs, or which ones were availabe, you needed skills, or they were part time.
The only thing that has ever motivated me is money, so when one day my wife was asked by a friend if she knew a window cleaner has she needed £1000 worth of window cleaning doing, as fast as I could I ran to the shop, bought a bucket and sponge, oh and borrowed a ladder, and just grown from there.
In all the time since the biggest motivator for me is still money, admittidly I chase turnover, but thats not saying profits are low, in fact my business operates at 50% net profit, which is very good considering the size of my wage bill.
I will keep on in this manner until I feel I get to a level where I have a saleable business.
So the answer in a long winded way is having enough money to maintain my lifestyle and not having to worry about bills, I cant remember the last time a bill dropped through the letter box and thought "How the hell am I going to pay that"