Shifting nidānas in Buddhist scripture signal different possibilities for what it means to embody the time of liberation, in short, buddhahood. This paper provides a close reading of the nidāna of an important, never-before studied Dzogchen Heart Essence (Tib. Snying thig) tantra called Secret Tantra of the Sun: Blazing Luminous Matrix of Samantabhadrī (Tib. Kun tu bzang mo klong gsal ’bar ma nyi ma’i gsang rgyud). I contextualize Tantra of the Sun and its transmission history and then provide a section-by-section translation and analysis of its nidāna with cross-citations from other chapters of the tantra to clarify key terminology, such as the meaning of “matrix” (Tib. klong). I argue that Samantabhadrī’s awakened speech is so powerful that it catalyzes the primordial ground to manifest as ground appearances (Tib. gzhi snang), demonstrating that awakened speech has the potential to disrupt samsaric time. Tantra of the Sun repeats and varies the five perfections in creative ways that explicitly perform the mirroring of text, to cosmos, to body that we find in tantric literature more generally, illustrating that the time of liberation is pervasively entextualized into the subtle body through Samantabhadrī’s speech.