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There are certain things we can know for sure through the scriptures, and finally I have a chance to talk about this question on this thread, so thanks for asking. :)

Gautama Buddha taught for about 40 years and met lots of people. If we try to summarize just a few parts, of _all_ of his teachings over his entire teaching career, what do we come up with?

The two things are as follows:

1. Transmigration

2. The law of cause and effect

An Enlightened being tells about 'what is' in the world, and can teach people how the world works. That's exactly what Gautama Buddha taught, although he taught it quite a long time ago.

Finally, there's more evidence in the content of the prajna paramita sutra, if you have seen that one, which explains about some cases in perfecting oneself and opening one's wisdom eye. No one can explain that content without already having been Enlightened.