The idea of divine temples
The forbears of the Greeks, the Myceneans, are known to have had their own gods. However, they did not build temples until their descendants came into contact with the Egyptians.
The philosophical significance of temples is that while most would suppose that their deity’s presence is everywhere, temples tend to be the points where the deity is manifested more than other places – like how Christians believe God is everywhere but a church is his “house”.
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We now know from historical investigations that the Greeks thought of their temples in the same way as the older Egyptians.