YOU SAID:

everything that happens once can never happen again, but everything that happens twice will surely happen a third time

INTO JAPANESE

一度起こったことは二度と起こりませんが、二度起こったことは必ず三度目に起こります

BACK INTO ENGLISH

What happens once doesn't happen again, but what happens twice always happens a third time.

INTO JAPANESE

一度起こったことは二度と起こりませんが、二度起こったことは常に三度起こります。

BACK INTO ENGLISH

What happens once never happens again, but what happens twice always happens three times.

INTO JAPANESE

一度起こったことは二度と起こらないが、二度起こったことは必ず三度起こる。

BACK INTO ENGLISH

What happens once never happens again, but what happens twice always happens three times.