烟只过肺不过心烟只过心不过肺
[yān zhĭ guò fèi bù guò xīn yān zhĭ guò xīn bù guò fèi]
The phrase 'Yan Zhi Guo Fei Bu Guo Xin' followed by 'Yan Zhi Guo Xin Bu Guo Fei' juxtaposes smoking passing only through the lungs not touching the heart, with smoking going into the heart rather than the lungs. It expresses two conflicting sentiments or situations, one superficial while the other deeply personal. Generally, it contrasts the outward appearance of actions with their internal effects.