I am for the people of the whole nation doing just as they please in all matters which concern the whole nation; for that of each part doing just as they choose in all matters which concern no other part; and for each individual doing just as he chooses in all matters which concern nobody else.
We cannot conceive of matter being formed of nothing, since things require a seed to start from... Therefore there is not anything which returns to nothing, but all things return dissolved into their elements.
To regard one's immortality as an exchange of matter is as strange as predicting the future of a violin case once the expensive violin it held has broken and lost its worth.
For every one billion particles of antimatter there were one billion and one particles of matter. And when the mutual annihilation was complete, one billionth remained - and that's our present universe.