The philosophers are good at categorizing things, the scientists are good at categorizing things. Their whole effort is how to categorize, how to put everything in a particular category -- this is this, that is that -- and they go on and on. They are not in search of the organic unity of life, they are not in search of the ultimate principle of life that runs in the trees and the mountains and the stars and the animals and the birds and men and women. They are not in search of that unifying factor. That unifying factor is what religions have called the truth, what Buddha has called NIRVANA, what Jesus has called the kingdom of God.