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[Robert Vermaat]

There was no thought in ancient Greece whatsoever about abolition of slavery.

I had heard that one Ancient Greek once said something like; "When the food cooks itself and the cup washes itself, then we will give up slaves."
Assuming someone did actually say or write it, it must have been in response to a thought about the abolition of slavery.

Indeed.
I'll clarify my position a bit more. I don't think there was any thought in ancient Greece (or Rome) whatsoever about abolition of slavery on the grounds that human beings had an basic right to be free and could not be 'owned' by another human being.

Slavery was not uncomplicated. Slaves were seen as bother some too. Not to mention the neverending threats of war or debt wherein oneself could become enslaved. I dare to venture that the quote above was more in the line of that.

But to get back to my original remark, I think there were Greeks during the Roman period who also did memorable things - but the period was cut out of the history parade. Too bad.