"Society has a right to demand from historians accounts which can, if so desired, be used in trying to understand the evolution of political ideas or institutions, or the origins of the many conflicts throughout the world, or to gain the necessary contextual information for enjoying more fully a painting or a poem or some favourite tourist attraction. Those seeking such understandings will not be helped by some speculative theory about the need to replace humanism with radical ideology, or of the inescapability of their situation within language, but will want to feel that the explanations, interpretations, and information they are provided with are based on serious study of the evidence; and it will do them no harm at all if they are also made aware that all sources are fallible, that all study of them must be carried out in accordance with the strictest principles, and that there are always things which we do not know with any certainty."