Line them up in your mind, practice insight, acknowledge complexity, arrive at some big ideas.

As you age from infant age, your vision gets better, and maybe in your late teens, early twenties, you're looking for a mate, and your vision goes after that.

But, using your powers of insight, you're noticing other smaller things how Darcy's eyes linger on Lizzy's face and how he seems all flustered when she's around.

Add to the mix your knowledge that Mr. Darcy is in a much higher social class than Lizzy, and your sense of insight should be telling you that there's something more here.