Graham and Dodd quote

From Security Analysis:

When in his capacity as investor or speculator the business man elects to pay no attention whatever to corporate balance sheets, he is placing himself at a serious disadvantage in several different respects: In the first place, he is embracing a new set of ideas that are alien to his everyday business experience. In the second place, instead of the twofold test of value afforded by both earnings and assets, he is relying upon a single and therefore less dependable criterion. In the third place, these earnings statements on which he relies exclusively are subject to more rapid and radical changes than those which occur in balance sheets. Hence an exaggerated degree of instability is introduced into his concept of stock values. In the fourth place, the earnings statements are far more subject to misleading presentation and mistaken inferences than is the typical balance sheet when scrutinized by an investor of experience.