Eruvin 13a-13b
The structural changes needed to permit carrying in alleys with narrow entryways \u2022 Sharpening the mind: a bit of disorientation dislodges dulling assumptions \u2022 May vitriol or iron sulfate be added to scribal ink? \u2022 Conscientious writing as required for valid bills of divorce and Parshas Sotah for the suspected adulteress \u2022 Words of the Living God: Legitimate conflict \u2022 Humility: the secret to grasping Truth \u2022 To be or not to be, no longer a question