Serenity boat/love quote

Capt. Malcolm Reynolds: It ain't all buttons and charts little albatross. Do you know what the first rule of flying is? Well I suppose you do since you already know what I am about to say.
River Tam: I do. But I'd like to hear you say it.
Capt. Malcolm Reynolds: Love. Can know all the math in the 'verse, you take a boat in the air and you don't love, she'll shake you off just as sure as the turn of the worlds. Love keeps her in the air when she oughta fall down. Tells you she's hurting before she keels. Makes her home.