everything is against everything changes. The buddhism assigns two qualities of the existence that deny the essence. The characteristic of us or not-soul (they anatman) and the impermanencia (anitya). The buddhism does not speak of the anything but of the emptiness (sunya). The Sutra of the Heart is seen. And there is a great difference.
The nothing is impassable, but the emptiness it is possible to be entered, luckyly. The meditation is the entrance in the emptiness. Nirvana (according to its primary etymological meanings) is the happiness of the extinction, the limitless happiness that provides the emptiness. Reason why it is not been mistaken to say that empty is everything and is nothing at the same time. The meditation is the key of entrance to the anything. Nihilist and the existencialistas ones closed that door with key they threw and it to the ocean so that we could not never find it.
They said to us that there was no key, is more, than there was no door. And, surely, they believed therefore it, did not deceive, simply to us did not know it. They entered the anything with the key of the reason, the intellect. They abrieron the door without seeing the door, used the key without seeing the key. And soon they closed that door with a different, imaginary key, and they said to us that the door was closed. But the key of the meditation only abre the door, does not close it. That is the difference. As much the Buddhist conception of the existence, like nihilist or the another system of thought, is still allegorical: image, word, oration. To create theories is equivalent to pray, to loosen the reason by the mouth. We create a logical-causal thought, without giving account us of which we invented the causes. We invent the logical system and on so we worked, we thought, we created.