The real meaning of the word Tantra is Shastra, as for example, Kapila Tantra. But the word Tantra is generally used in a limited sense. Under the sway of kings who took up Buddhism and preached broadcast the doctrine of Ahimsa, the performances of the Vedic Yaga-yajnas became a thing of the past, and no one could kill any animal in sacrifice for fear of the king. But subsequently amongst the Buddhists themselves—who were converts from Hinduism—the best parts of these Yaga-yajnas were taken up, and practised in secret. From these sprang up the Tantras. Barring some of the abominable things in the Tantras, such as the Vamachara etc., the Tantras are not so bad as people are inclined to think. There are many high and sublime Vedantic thoughts in them. In fact, the Brahmana portions of the Vedas were modified a little and incorporated into the body of the Tantras. All the forms of our worship and the ceremonials of the present day, comprising the Karma Kanda, are observed in accordance with the Tantras.