Hinduism
According to the most famous Western Tantrik scholar, Sir John Woodroffe (pseudonym Arthur Avalon): "The Indian Tantras, which are numerous, constitute the Scripture (Shastra) of the Kaliyuga, and as such are the voluminous source of present and practical orthodox 'Hinduism'. The Tantra Shastra is, in fact, and whatever be its historical origin, a development of the Vaidika Karmakanda, promulgated to meet the needs of that age. Shiva says: 'For the benefit of men of the Kali age, men bereft of energy and dependent for existence on the food they eat, the Kaula doctrine, O auspicious one! is given' (Chap. IX., verse 12). To the Tantra we must therefore look if we would understand aright both ritual, yoga, and sadhana of all kinds, as also the general principles of which these practices are but the objective expression." (Introduction to Sir John Woodroffe's translation of "Mahanirvana Tantra.")