Life tests first and gives lessons after. You will retake the test as many times as you need until you learn the lesson.  
There is one lesson that Celestia has had to relearn far too many times. That lesson is that power can corrupt the heart of anypony. It is a lesson that Celestia’s ancient heart cannot bare to have to learn again. No, the loss of her dear Twilight has left a shard of ice in her heart that no pony can ever hope to thaw.  
She spends every single day of this war hoping that somewhere in her enemy’s mind, lies the pony she once mentored. She spends every day, fearing that her hope is misguided.  
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This is the first drawing I’ve ever scanned and colored. I like the result, my traditional sketching looks quite different than my digital sketching.