Write it down

The self help, business success and motivation books will tell you goal setting is important.

It is.

They'll tell you it's important for accountability, for business growth, for success.

It is.

But it's more important for those days when you are sitting at your desk (or in bed, or where ever you reflect) and thinking "will I ever make it?" 
Because 2 weeks, 3 months, 5 years ago you were probably thinking exactly the same thing, except you were wondering if you would ever make it to where you are now.
So write it down, record where you want to be and what you want to do because when you get there you will have different goals. 
When you are feeling like it's a struggle you will forget that you made it to where you wanted to be at that time, it's just that you want to be somewhere better now.