When one steals knowledge (Gneivas Daas) and gets caught by witnesses, how does he pay back double?
PS. Why is there no Gzeilas Daas?
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By the very act of the theft he's already paid it back double.
How so? דעת equals 474, so a double payment for that would be 948. This is the gematria of the verse (Ps. 116:11):
אני אמרתי בחפזי כל האדם כזב
"I said in my haste, 'All people are deceitful.'"
- which is what the victim now knows to be true in one more case than he did before.