“Kol ha'olam kulo gesher tzar me'od, veha'ikar lo le'fached klal.”
All the world is a very narrow bridge, and the most important thing is not to be overwhelmed by fear.
Derived from Likutei Moharan II #48, וְדַע, שֶׁהָאָדָם צָרִיך לַעֲבר עַל גֶּשֶׁר צַר מְאֹד מְאֹד וְהַכְּלָל וְהָעִקָּר שֶׁלּא יִתְפַּחֵד כְּלָל
"...Now know, a person needs to pass over on a very, very narrow bridge, and the rule and the essence is to not be afraid at all..."
Attributed