tantra - According to Ayurvedic Doctor (Vaidya) Dr. Vasant Lad, “Tantra is a spiritual path utilizing a set of demanding practices that require great (maha) discipline (shila paramita), strength (bala paramita), and understanding (prajna paramita).”
Vaidya Vasant Lad, Textbook of Ayurveda Volume 1, 2001: p. 311