“The urge to give up is always the greatest when you’re about to succeed.” -Unknown
Seth Godin would call this The Dip and he filled a whole book about it. It is important to be able to differentiate between whether you are going through the dip or if it is really time to close shop and move on to another idea.

I can’t remember where i found this one but if anyone knows the source, please post in the comments and I’ll put it in here.
“Bob would fail if he did average work for average editors just to make a living. But by turning down the average stuff and insisting on standing for something on the edge, he profits. By challenging his clients to run stuff that makes them nervous (and then having them discover that it’s great), he profits.
This is scary. It’s really scary to turn down most (the average) of what comes your way and hold out for the remarkable opportunities. Scary to quit your job at an average company doing average work just because you know that if you stay, you’ll end up just like them. Scary to go way out on an edge and intentionally make what you do unattractive to some.
Which is why it’s such a great opportunity.
- Seth Godin”
I love this one..
“People are always blaming their circumstances for what they are. I don’t believe in circumstances. The people who get on in this world are the people who get up and look for the circumstances they want, and, if they can’t find them, make them.”
- George Bernard Shaw
“If you are lucky enough to find a way of life you love, you have to find the courage to live it.”
- John Irving