I'm reading an introduction to Philip K. Dick written by Roger Zelazny. This introduction is included in PKD's novel Do Androids Dream of Electric Sheep and the following paragraph is Roger Zelazny's praise about PKD:

"Inventiveness. Wit. Artistic integrity. Three very good things to have. To say them, however, is perhaps to talk more about the mind behind the words than the ends to which they are addressed. For to say them in all good-intentioned honesty about a story results mainly in a heaping of abstractions."

I'm so confused about the part in bold characters that I don't even know how to explain what confuses me. The sentences just seem very long and complicated. Even though I know every word of them, I still don't understand their meanings. I guess the only part I understand is that "the mind behind the words" refer to the author. So does "the ends to which they are addressed" refer to the readers? Does "to say them in all good-intentioned honesty about a story" mean "to talk about a story honestly in terms of the three aspects"?

Anyhow, I don't understand the meaning of the whole sentences. Can anybody kindly explain the idea for me?