Strength of principles,

I would change your punctuation.

The theory was yesterday . The theory still is today, and will be tomorrow. The world stands on the strength of principles. Theories will end the day the world will end.

Wow Mera, if its meaning were clearer it would be easier to punctuate. The Average Clod for instance (me) might read the last two phrases as independent assertions, e.g, "theories will end the day," meaning theory is subservient to principle; and "the world will end," meaning "who cares what I just asserted"

I like Fresco's version tho I don't fully understand it