Acharya Prashant begins by defining 'Asat' as that which continuously changes in time, and 'Sat' as that which remains unchanging in time. He then refutes the idea that Truth (Satya) is 'Sat', explaining there is a significant difference between the two. The speaker clarifies that 'Sat' is 'Mool Prakriti' (fundamental nature), or more precisely, 'Mool Ahamvritti' (the fundamental ego-tendency). This fundamental ego-tendency is what remains unchanging. Conversely, 'Asat' refers to all the forms that the ego-tendency (Ahamvritti) takes, which are constantly changing. Examples of 'Asat' include houses, trees, persons, places, and planets, as they are all observed to change over the passage of time. The one thing that cannot be seen changing is the fundamental nature (Mool Prakriti) itself. The speaker emphasizes that Brahman, or Truth (Satya), is neither 'Sat' nor 'Asat'. This is because Truth is not in time at all; it is timeless. He distinguishes between 'permanent' and 'timeless', noting that permanence implies being unchanging *within* time, whereas timelessness transcends time altogether. Therefore, Truth is not permanent but transcendental. Both 'Sat' (the unchangeable) and 'Asat' (the changeable) pertain to existence. Truth, however, is the central point and origin of existence but is not contained within it. The speaker explains that an individual and Truth cannot exist concurrently. If you exist, Truth does not, and if Truth exists, you do not. He quotes, "Two cannot fit in it." This leads to the paradox of human desire: the fundamental desire is for liberation from things, yet it manifests as a desire for things. The real desire is not for attainment but for liberation. The speaker concludes by stating that the entire existence, with its myriad mutable forms and its unchanging core, is the foundation. The unchanging core of existence is its very tendency to exist.
