Interruptions, delays and pushing through

All of us have long range goals such as building a business, finishing a degree, or getting a promotion.  Sometimes long range plans come unexpectedly and are put upon us, like restoring health, getting through a crisis or a loss.  The long range goal seems distant but according to the experts there is also need for smaller milestone goals so that the goal seems manageable. 
What the experts don't tell you is that even with smaller milestones there will come a time, (just before the finish line) when setbacks happen, strength fails and we doubt the necessity to even finish.  Sometimes we have tried to accomplish a goal 14 different ways and you don't have any idea what to try next.  The thought of quitting is appalling but the thought of having to push ONE MORE TIME, to TRY ONE MORE TIME is even worse because there is no more strength, none.
The things that we envision, create, accomplish and build on our own with only slight resistance is great.  We move along believing we are fully capable of accomplishing our goals and we have faith in the work of our own hands. Those little milestones that motivate us to keep going work. But as we get close to the mark, as we think we have it under control we realize the mountain might just be too high to climb.  
I believe we are supposed to reach the end of ourselves.  I believe that circumstances in our lives are orchestrated so that we have no more of our own strength left.  Why? Because resistance builds muscle?  Maybe, but I think that something more profound happens in these tests.  We learn that we can't do it alone.  We learn that todays strength will never be enough.  We learn that todays skill and talent will only carry us so far and no farther.  That the only way to truly learn is to understand that in the scheme of the universe, we know nothing.  When we reach the end of our skill, our understanding and our wisdom, we are forced to look for other answers and the wisdom of the ancients.  We are forced to develop new strength.
I started this project (which was supposed to be quick and part of the "building plan")  but just as I was close to putting on the new stain, I injured my hand and wrist.  At the same time a couple other challenges came up that I did not want to deal with and I felt blocked, tired and bewildered.  So I took a break, read, meditated, pouted and soon I had the strength, the new vision and the ability to complete all the tasks.  Even beyond that I was wiser, better connected to the universe and I had peace.