From Security Analysis, 1940 edition:
"Analysis is concerned primarily with values which are supported by the facts and not with those which depend largely upon expectations. In this respect the analyst’s approach is diametrically opposed to that of the speculator, meaning thereby one whose success turns upon his ability to forecast or to guess future developments. Needless to say, the analyst must take possible future changes into account, but his primary aim is not so much to profit from them as to guard against them. Broadly speaking, he views the business future as a hazard which his conclusions must encounter rather than as the source of his vindication."