। ॥ ३१ ॥
In plain words
With sixty-four Tantras, each limited to a different Siddhi or spiritual attainment, Paśupati had kept the whole world bound. At your urging he then brought your Tantra down to earth, free in itself to fulfil the whole range of Puruṣārthas, the aims of human life.
Close to the Sanskrit
Having kept the whole world bound with sixty-four Tantras, each dependent on bringing forth its particular Siddhi, Paśupati remained; then, at your insistence, he brought down to earth this Tantra of yours, independently capable of accomplishing all the Puruṣārthas—the aims of human life—together.