Sustaind.org is sick. :( If you're a PHP programmer, can you help us upgrade Sustain'd and get it working again? If interested, email richard AT moregoodfoundation DOT org.
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sustain!
“I was once that which you are, and what I am you will also be.” This is the translation of the Latin inscription on the sarcophagus below Christ on the cross. This lone phrase sounds not unlike our controversial couplet "As man is God once was, as God is man may become." http://en.wikipedia.org/wiki/Holy_Trinity_%28Masaccio%29

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Anyway, as for the caption on the painting: Does not sound to me like it is any kind of doctrinal statement...merely a statement that man is mortal.