Habermas understands presupposition (5) to be responsible for generating the self-understanding and continuation of theoretical and practical discourses. Presupposition (5) points out that the validity of an understanding reached in theoretical or practical discourse, concerning some factual knowledge or normative principle, is always expanded beyond the immediate context in which it is achieved. The idea is that participants in discourses such as these presuppose that any understanding reached could attain universal agreement concerning its universal validity if these discourses could be relieved of the constraints of time and space. This idealized presupposition directs discourses concerning truth and normative certainty beyond the contingencies of specific communicative situations and towards the idealized achievements of universal consensus and universal validity. It is a rational reconstruction of the conditions for the possibility of earnest discourses concerning facts and norms. Recall that, for Habermas, rational reconstructions aim at offering the most acceptable account of what allows for the competencies already mastered by a wide range of subjects. In order for discourse to proceed, the existence of facts and norms must be presupposed, yet the certainty of an absolute knowledge of them must be, in a sense, postponed.