The Sudilkover Rebbe told me recently that he had some bad news to share with me. The laptop computer he was using to work on his new edition of Degel Machaneh Ephraim was severely damaged and computer specialists could not restore the contents of his hard drive. This hard drive contained the only copy of his commentaries on the Vayikra and Likkutim sections.
Countless hours and of months of work vanished.
When his son asked him why he thought it happened, the Rebbe responded that perhaps he not have the right machshavos (thoughts) when working on it. He had done much of the work on these lost sections following the death of his father. The Rebbe explained to his son that it was also possible that he did not work with the proper simcha that was necessary when working on a sefer as holy as Degel Machaneh Ephraim.
Instead of becoming frustrated and irate about this unfortunate occurrence, the Rebbe accepted it with simple emunah. His reaction thus became an important life lesson to me; don't rush to cast blame on something external when more the likely the problem was created by a deficiency that was internal.