1. Moral decadence of Buddhism
According to K.W. Morgan, Rahul Sanskrityayana and many others are of the most important causes of the decline of Buddhism was the moral decadence of the Buddhists. Even the earliest Buddhist texts reveal an awareness of tendencies towards the moral decadence in Sangha express to the point where large numbers of monks were amassing personal or Community wealth and engaging in various other improprieties .