Sutra

Without explanation:
Soul is, for there is no proof that it is not. (Sutra 1, Book 6) This
different from body, because heterogeneous. (Sutra 2, Book 6) Also
because it is expressed by means of the sixth. (Sutra 3, Book 6)

With Vijnanabhiksu’s explanatory bhasya filled in:
Soul is, for there is no proof that it is not, since we are aware of “I
think”, because there is no evidence to defeat this. Therefore all that
is to be done is to discriminate it from things in general. (Sutra 1,
Book 6) This soul is different from the body because of heterogeneous or
complete difference between the two. (Sutra 2, Book 6) Also because it,
the Soul, is expressed by means of the sixth case, for the learned
express it by the possessive case in such examples as ‘this is my body’,
‘this my understanding’; for the possessive case would be unaccountable
if there were absolute non-difference, between the body or the like,
and the Soul to which it is thus attributed as a possession. (Sutra 3,
Book 6)

–Kapila in Samkhya Sutra, Translated by James Robert Ballantyne