(The Nirvana sutra states " People have been suffering sinse uncountable aeons ago. The bones each individual leaves behind in an aeon pile up as high as Mount Vilula in Rajagriha, and the milk he sucks is equal to the water of the four oceans. The blood one sheds surpasses the quanity of water in the four oceans, and so do the tears he sheds in grief over the death of parents, brothers and sisters, wives, children and relatives. And though one used all the plants and trees growing in the earth to make four-inch tallies to count them, one could not count all the parents one has had in the past existences of life.)