If most of us are ashamed of shabby clothes and shoddy furniture, let us be more ashamed of shabby ideas and shoddy philosophies.

Attributed to Einstein in Treasury of the Christian Faith (1949) p. 415 books.google, and subsequently repeated in other books. No original source where Einstein supposedly said this has been located, and it is absent from authoritative sources such as Calaprice, The Ultimate Quotable Einstein. The phrase can be found on p. 16 of the 1933 edition of the book series A Set of Holiday Sermons, part of the sermon "Facing Tomorrow" by Rabbi Joshua Liebman which begins on p. 10. Liebman does not attribute it to any other source, but states it without quotes as part of his own sermon.