The Basics of Judaism: Jewish Texts: The World as a Narrow Bridge:
What is the origin of the statement that the world is like a narrow bridge?
The comparison of the world to a bridge isn't in the Bible; in fact, the word "gesher" isn't Biblical Hebrew. An early comparison of the world to a bridge is found in the dialog "Ben ha-Melech veha-Nazir" by R. Avraham b. Chisdai (Spain, mid-1200's); but the "narrow bridge" phrase seems to come from Likutei Maharan, a collection of sayings by the renowned Chassidic Rebbe Nachman of Bratslav.
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