@arso
Even I [surprise] can give you a source . the current rebbi of habad-
He writes in a sicha that the baal hatanya was greater than R Yochanan Ben Zakai because RYBZ was not in touch with his neshama , he was too busy with his avodat hashem so he had never time to check his neshama it should not be in the kelipa .
So from there you can see the importance of checking your neshama ….
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