तस्य हेतुरविद्या ॥२४॥
tasya hetur-avidyā ||24||

[RS] 2.24 The root cause of identification with the mutable is a lack of insight (avidya).

[JW] 2.24 The reason for this [correlation] is undifferentiated-consciousness (avidya).

[SS] 2.24 The cause of this union is ignorance.  [p112]

[EB] 2.24 The cause of conjunction is ignorance. [p232]

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(तस्य, tasya) = whose
(हेतुः, hetuḥ) = cause
(अविद्या, avidyā) = ignorance; confusion; lack of insight