Dealing With Disappointment

I am continuing to go down the list of hindrances to motivation and excuses.

I had developed quite a bit of forward momentum from Day 1.  Since then I have been getting a massive amount of things accomplished. I already settled into my new chore schedule, whittled away my to-do list, drank a liter of water a day, and turned the world upside at work.  Then today, like a freight train, disappointment hit.  It involved something I had poured my heart and soul into, and it didn't turn out the way that I desired, or planned.  And God understands how disappointment feels to us.  He said "hope deferred makes the heart sick (Prov 13:12)".
However, I let this disappointment began to affect my disposition.  Once I allowed it to do that, motivation flew like a wild bird out of the window.
All of this forward momentum I had created and all of the tall buildings I leaped in a single bound, got to my head. I somehow thought I had the Midas touch or something.  That quickly I had forgotten, that it is God who arms me with strength, and makes my way perfect.  I had forgotten my prayer about God working in me both to do and want to do what pleases Him.  I had accomplished what I did because of Him, and if I  but trust in Him, give this matter to Him entirely, He can bring success in that too.
I breathed a little bit more. 
Regardless of what the disappointment or delay is, it can have the same text book effect.  It kills motivation.
We must stop the train of disappointment, thoroughly inspect the cargo, and not allow delivery of the tainted goods.
Paul said this to the Corinthians "therefore we do not lose heart...for our light and momentary troubles are achieving for us an eternal glory that outweighs them all.  So we fix our eyes not on what is seen, but on what is unseen.  For what is seen is temporary, but what is unseen is eternal (2 Cor 4:16-18)".