— what (use); — with the Vedas; — what; — and with the Purāṇas; — what; — with the (other) scriptures; — many; — O Śivā; — when (this) is fully known; — this; — the great Tantra; — master of all attainments; — would become
What use are the Vedas, the Purāṇas, or the many other scriptures, O Śivā? When this great Tantra is fully known, one becomes master of all attainments.