From Martin Buber's Tales of the Hasidim: the later masters, pps 249-250, a zen-like story about Rabbi Simcha Bunim of Peshischa (1765-1827):

Rabbi Bunam said to his disciples:

"Everyone must have two pockets, so that he can reach into the one or the other, according to his needs. In his right pocket are to be the words: 'For my sake was the world created,' and in his left: 'I am earth and ashes.'"

... or in another form, without attribution, in "What I Carry" and many other places:

It was said of Reb Simcha Bunim that he carried two slips of paper, one in each pocket. On one he wrote: Bishvili nivra ha-olam – "for my sake the world was created." On the other he wrote: V'anokhi afar v'efer – "I am but dust and ashes."

^z - 2023-05-22