There are no different forms or degrees of adhiṣṭhānam, nor is it reducible to a deeper carrier of reality. Everything that manifests from this basis is actually nothing else than this basis (hence non-dual). It is the single reality, not two (advaita). The only adhiṣṭhānam is cit or caitanyam (both terms for consciousness).

When I understand that I am the substrate, the deeper truth of everything, I can resign myself to myself. This goes so far that we can say, “Even though I do not know the substance of this basis, substratum, or ground, in the sense I do not know what it is,” we can say, “I know that I am the basis (ahaṁ jāne adhiṣṭhāna asmi).”