I would like to upvote the Feynman quote. I am not interested in upvoting the Stephenson quote.

I would like to upvote the Stephenson quote, and not the Feynman quote.

You two talk between yourselves so that only one of you upvote the entire comment.

Or, you both downvote the conglomerate and each write a comment expressing objection to the combination, approval of the desired quote and indifference to the other.

(I downvoted the conglomerate on the principle "I wish to see less quote-comments that people believe should be separate, especially when said quotes are verbose anyway". There is an implied "...and would upvote both comments if they were split to encourage trivial improvements in response to feedback".)