Just as ultra-pure water created by thoroughly removing all impurities behaved
differently from normal water, the phenomena created by “cutting off a portion of space
to obtain a unique color” had tremendous power.

- Shinyaku Toaru Majutsu no Index Volume 10 Chapter 13 Part 3
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“Higher lifeforms like Coronzon and Aiwass are not that common. For one thing, there
are no truly pure elements in the surface of the Four Worlds. Accelerator, you bear the
name of a particle accelerator, but not even your power can fully separate them.”

- Shinyaku Toaru Majutsu no Index Volume 20 Chapter 3 Part 5
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“It is time to shake Kochab, the planet protected by Raphael. But do not forget. Though
the names may differ, the entire celestial sphere points to a single tree. All elements fall
within my grasp and no element found on the surface of the four worlds or to the very
ends of this earth can be fully separated. Therefore, only the appropriate knowledge
allows one to reach their pure form.”

- Shinyaku Toaru Majutsu no Index Volume 21 Chapter 1 Part 8
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“You may have broken the hot and dry, but the hot and wet and cold and wet are joined
with it. There are no pure elements at the surface of the four worlds, but the isolated cold
and dry will use its great influence to disturb the world’s harmony. Earth born of fire, use
your great fusion to reinforce your meaning and strike the destroyer of the elements!!”

There were four elements.

In the largescale ceremonial magic used by the Golden cabal, you could not exclude any
of those four even if you only wished to use the one.

In a technical sense, there were no pure elements in this world.

For example, fire always contained some trace amounts of water, wind, and earth.

Trying to remove that margin of error would be the same as forcibly removing electrons
or protons from stable atoms or molecules.

- Shinyaku Toaru Majutsu no Index Volume 21 Chapter 3 Part 16