How do we feel about quoting Vonnegut in a fiction project?

Specifically, Cat’s Cradle.

I think he did a great job of explaining a few things through the fake religion Bokononism, and wanted to use it briefly in one chapter to teach my character something, or inspire her to think about another aspect of her life. She mainly contemplates the new definitions introduced in the book, like foma and karass.

Would it be illegal or wrong to quote this book? It was written in 63, and Vonnegut hasn’t been gone for that long. I highly respect him and don’t want to stomp on his grave, or get sued haha