Ben Graham’s Security Analysis (1940) excellent 70 pages of notes.

The old idea of “permanent investments,” exempt from change and free from care, is no doubt permanently gone. Our studies lead us to conclude, however, that by sufficiently stringent standards of selection and reasonably frequent scrutiny thereafter the investor should be able to escape most of the serious losses that have distracted him in the past, so that his collection of interest and principal should work out at a satisfactory percentage evening times of depression. Careful selection must include a due regard to future prospects, but we do not consider that the investor need be clairvoyant or that he must confine himself to companies that hold forth exceptional promise of expanding profits. These remarks relate to (really) high-grade preferred stocks as well as to bonds.


Full pdf here