The Vishnu Purana
Chapters
The Vishnu Purana: Book I: Chapter VI

45:5 These eight perfections, or Siddhis, are not the supernatural faculties obtained by the performance of the Yoga. They are described, the commentator says, in the Skánda and other works; and from them he extracts their description: 1. Rasollásá, the spontaneous or prompt evolution of the juices of the body, independently of nutriment from without: 2. Tripti, mental satisfaction, or freedom from sensual desire: 3. Sámya, sameness of degree: 4. Tulyatá, similarity of life, form, and feature: 5. Visoká, exemption alike from infirmity or grief: 6. Consummation of penance and meditation, by attainment of true knowledge: 7. The power of going every where at will: 8. The faculty of reposing at any time or in any place. These attributes are alluded to, though obscurely, in the Váyu, and are partly specified in the Márkańd́eya Puráńa.