Creation is never constant ever, it is always changing form, going up or coming down. Our life is also never a constant, there are upturns and there are downturns in an indvidual’s life. In economics, it is said that a company whose graph is horizontal, that is where there is no upturn or downturn, that company would shutdown in a short while. Even a downturn is considered a growth factor. This law is constant in all aspects of creation. It is also applicable to yogis and to huge empires. Upturn and downturn cycles are very important for growth. With every downturn, one must use its momentum to reach a new high.
In today’s world, increasing influence of asuric forces can be traced back to the beginning of invasions by nomadic tribes of Arabian Peninsula and tribes from far reaches of Europe. Take, for example, the Portuguese invasion of West coast of India in the sixteenth century which brought in its wake large scale destruction of the temples, burning of ancient scriptures as well as disbanding of yagyas and other spiritual practices in the region or the invasions by Ghori and Ghazni.