The main point of Greg's lecture, I think, was contained in a quote from Walter Brueggemann, which I think I copied down correctly:
"Truthful statements must be continually stated to remain truthful."
This might sound scandalous to ears suspiciously seeking postmodern ideas, but I believe it is true. To use a silly example: Many years ago if you called a girl 'cute' she might have sucker-punched you. Why? Because 'cute' used to mean 'bow-legged.' In order for 'that girl is cute' to be true in its original sense, we must restate the proposition: 'that girl is bow-legged.''
On a deeper level we can look at the word 'Gospel.' One of the speakers at the conference made reference to this. It was either Greg or one of the guys who did a devotion. Anyway, the word 'euangellion,' which is Greek for 'gospel,' literally meant 'good news,' but in its context it was good news of a particular type. One could tell 'the gospel of Caesar,' which would extol his good works and the wonderful things that resulted from his reign. This affected the way 1st Century people would have understood the phrase 'the Gospel of Jesus Christ.' It did not mean 'Jesus died for our sins and rose again' to them. That would be part of it, but not nearly all. That is how most people understand the word 'Gospel.' It's either the formula I mentioned or a reference to a genre of music. In order to help people understand what 'gospel' originally meant, we must restate it.
Greg used an Ezra Pound quote to translate this need for restatement into the realm of art. Pound said, "the artist's motto is 'make it new'." The IT, said Greg, is something unchanging. Great art is still working with the fundamental data of this world. That statement resonates with me. I see it in both Rembrandt and Picasso. Sometimes they might come from vantage points I reject, but even if the images in a painting do not match the world I see in my eyes, I can understand the lens through which it is interpreted and thank God for the truth and beauty contained in the changing form.