So here Lord says, yadā yadā hi dharmasya glānir bhavati (BG 4.7). Yadā yadā hi dharmasya glānir bhavati means that whenever there is some discrepancy in the modes of rendering service of the living entity... Yadā yadā hi dharmasya glānir bhavati. Dharmasya means... I have explained to you. Dharmasya means my real nature. Dharma means my real nature. Dharma is not a faith. Dharma is not a designated faith. Dharma is my real nature. So when the real nature of the living entities are jeopardized, then, at that time, to make the adjustment, the Lord comes. Yadā yadā hi dharmasya glānir bhavati. And abhyutthānam, whenever there is discrepancy in the natural sequence and natural life of the human being, and there is artificial increase of sense gratification, at that time, when there is too much sense gratification...
Just like Lord Buddha. When did he appear? He appeared... He appeared in India. The condition of his appearance, perhaps you know. I shall still explain. When India was too much busy in animal slaughter. Of course, the Hindus, they, there are Vedic principles, animal slaughtering. They are... Just like in Muhammadans also, they have got some principle for animal slaughtering. You know, those who have read Koran, the Muhammadan religion allows animal slaughtering once in a year. It is called koravāni. And they can slaughter animals in the mosque. Similarly, in the Vedic religion also, the animals are allowed to be slaughtered in some sacrifice. But no religion, either Muhammadan or Hindu... I do not (know) in detail of your Christian religion, but they do not allow animal slaughter in the slaughter house. There are some particular rules and regulations. Anyway, that is a religious details.
But when India was too much addicted for animal slaughtering under the plea of Vedic sacrifice, the Lord Buddha appeared. Why? They misused the Vedic injunctions. They misused the injunctions of the Vedas. So he, he proclaimed, "No, this animal slaughter should be stopped." He did, he did not agree even with the Vedic injunction. Therefore Lord Buddha's preaching was not accepted. It was... Once it was accepted, whole of India accepted. Under the king, under the Emperor Aśoka, the whole of India became Buddhist. But later on, Śaṅkarācārya appeared and he made against them, Vedantists. So India, Buddhist religion from India was practically banished. So these are historical facts.