From the shinto perspective, why do humans need to undergo frequent acts and rites of purification

He believes that evil things are the consequences because of an evil spirit, therefore, he believes that prayer and rituals to kami prevent from this evil spirit

Explanation:

According to Shinto, the human being needs to be good from the heart.  it is the first thing that every parent taught to their children i.e to be humble and pure from the heart. He believes that evil things are the consequences because of an evil spirit, therefore, he believes that prayer and rituals to kami prevent from this evil spirit

for many centuries there were important factors which the economies of the muslim empires developed increasingly. they applied economic procedures in production, investment, finance, taxation and property. they used to tax certain goods (for example: harvest), they charged interest on money lent, they signed contracts with merchants; they relied on a common currency, and they used checks as well as promissory notes. with the money collected by means of taxation, the government provided the needy with an income. in addition, trading networks covered huge distances, so far regions started to have contact and exchange goods. this trade network covered areas of asia, africa and europe.