It is possible to fail in many ways . . . while to succeed is possible only in one way (for which reason also one is easy and the other difficult - to miss the mark easy, to hit it difficult).
"I can see nothing," said I, handing it back to my friend. "On the contrary, Watson, you can see everything. You fail, however, to reason from what you see. You are too timid in drawing your inferences."
We fail to see the purifying and refining effect wrought by the flames of adversity. These flames are not meant to consume but only to purify us. Disguised as adversity, blessings are showered upon us.