Read it through once

“You’re in love with yourself, that’s the Other!” Miss Stackpole declared. “Much good may it do you! But if you wish to be serious once in your life here’s a chance; and if you really care for your cousin here’s an opportunity to prove it. I don’t expect you to understand her; that’s too much to ask. But you needn’t do that to grant my favour. I’ll supply the necessary intelligence.”