Yiddish: Rashi isn't crazy.

There must be some sense to it, even if one doesn’t understand it.  SOURCE: Bernstein, Jüdische Sprichwörter und Redensarten.  Rashi (acronym for Rabbi Shlomo Itzhaki) was a medieval scholar whose extensive commentaries on the Hebrew Bible and the Talmud are highly respected and widely studied to this day.  Compare:

The world isn’t crazy.  |  Di velt iz nit meshuge.  |  .די וועלט איז ניט משוגע

Bernstein, Jüdische Sprichwörter und Redensarten

God is crazy.   |   Got iz meshuge.   |   .גאָט איז משוגע

Stutchkoff, Der Oytser fun der Yidisher Shprakh

רשי איז ניט משוגע.

Rashi iz nit meshuge.

Rashi isn’t crazy.