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Theories can either have something to say about the future or provide foundations for making judgments about the future. In either case, however, a theory remains inadequate for obtaining insights about the future which no amount of advancements in information access and quality or methodologies can overcome. This article suggests that inadequacy persists and cannot be completely overcome because of the long-term and short-term time perspectives embedded within a theory. Using illustrative examples of time perspectives from Morgenthau's theory of international politics, this article illustrates and analyses how long-term and short-term time perspectives within a theory delimit claims or judgments about the future made within or derived from a theory. Subsequently, readers gain insights on how to conceptualise long-term and short-term time perspectives, methods for identifying and differentiating between time perspectives within a theory and the distinct work time perspectives perform within a theory when multiple time perspectives are present. [ABSTRACT FROM AUTHOR]