My 1907 first edition of some French plays by Corneille, with notes in English, published by Henry Holt and Company, has the Paris coat of arms impressed on the front cover with the motto: fluctuat nec mergitur ("It will toss but will not sink").
It is a motto which applies a fortiori to the bark of Peter:
ECCLESIA CHRISTI FLUCTUAT NEC MERGITUR!
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