Different ages have certain approaches, which may be more effective for one age and no longer effective in another age. The world that we live in now has much greater density to it; it is much more all-pervasive. And when I say "world," I include the human mind in it. The human mind has grown even since the time of the Buddha, 2,500 years ago. The human mind is more noisy and more all-pervasive, and the egos are bigger.