Which one of the following texts of Classical Indian Philosophy contains this verse?
The verse highlights the significance of investigating the 'means of terminating' the 'threefold misery'.
This concept is explicitly addressed in the Sāṅkhyakārikā, the seminal text of the Sāṅkhya school in Classical Indian Philosophy.
The text argues that understanding and overcoming these sufferings through discriminative knowledge (viveka-khyāti) is the primary objective, thus motivating the philosophical enquiry.
Therefore, the verse is found within the Sāṅkhyakārikā.