This chapter draws the attention to systems of thought other than international law and that are similarly articulated around a postulation of the necessary presence of some content or substance deemed to be hidden in some way (what is called here the necessity of secret content) and/or the necessary performance of an act of revelation of some content or substance previously unknown (what is called here the necessity of revelation). The attention is drawn on the epistemologies of the secrets at work in Greek logocentric thought, in the Christian governance of the mind, in modern thought, in the idea of critique inherited from modern thought, in bourgeois literature, in Freudian psychoanalysis, in structuralist thought, and in poststructuralist thought.