Plain Difficult

I was reading Drama, from Ibsen to Eliot, and I came across this interesting Ibsen quotation, having to do with his transition from writing poetic drama to:

'...the very much more difficult art of writing the genuine, plain language spoken in real life... My desire was to depict human beings, and therefore I would not make them speak the language of the gods.'

There's something odd
about seeing
the language of human beings
as harder than the language of the gods.