"The challenges in our lives are there to STRENGTHEN our CONVICTIONS. They are NOT there to run us over."

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Now, as far as I knew, he (Luke) was still sailing around on his demon-infested cruise ship while the chopped-up Lord Kronos re-formed, bit by bit, in a golden sarcophagus, biding his time until he had enough power to challenge the Olympian gods. In demigod-speak, we call this a “problem.” - Percy, 'The Battle of the Labyrinth

— Rick Riordan