问世间情为何物直教人以身相许
[wèn shì jiān qíng wéi hé wù zhí jiào rén yĭ shēn xiāng xŭ]
Based on an ancient Chinese love poem, 'Asking Why Love Is So Strong That People Devote Themselves To It', this suggests the overwhelming power of love which makes people sacrifice all for each other, emphasizing the strength and intensity of emotions such a passion can create.