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Tattva Bodhaतत्त्वबोधः
Tattva Bodha · passage 30

Being

सत्किम्? कालत्रयेऽपि तिष्ठतीति सत् ।
satkim? kālatraye'pi tiṣṭhatīti sat |

What is sat, being? That which abides through all three times is being.

In plain words

What is sat (being)? That which exists in all three times, past, present, and future, is sat.