13 principals of Reb Yisrael Salanter

R. Yizchok Blazer zt”l (Peterburger) published the Sefer “Ohr

Yisrael”, a collection of writings and letters from R. Yisroel

Salanter. There is no mention  at all, of the 13 principals.

The first one to quote the 13 principals of R.Y.S. is

the Mekor Baruch (B. Epstein). He brings no source, from

where he got it.

It is possible , the Mekor Baruch confused the author of the

13 principals  with the Sefer Cheshbon Hanefesh. This

Sefer has the 13 Principals. It was republished (1845) with the

encouragement and involvement of R. Y. Salanter.