YOU SAID:

you'll never step in the same river twice

INTO JAPANESE

あなたは決して同じ川の中を二度歩くことはありません

BACK INTO ENGLISH

You never walk twice in the same river

INTO JAPANESE

同じ川で2度歩くことは決してありません

BACK INTO ENGLISH

I will never walk twice in the same river

INTO JAPANESE

私は決して同じ川で2回歩くことはありません

BACK INTO ENGLISH

I will never walk twice in the same river