折疑論 2.139

2.139

They did not know the way of reporting when going out and presenting oneself upon return, nor the etiquette of warming in winter and cooling in summer (gao is pronounced gu, elucidating the above text. The Book of Rites says: 'When going out, one must report,' the commentary notes: so that parents know where one is going; 'upon returning, one must present oneself,' the commentary notes: returning home to see one's parents, not daring to let parents be left waiting. In winter, one warms the parents' pillow and mat; in summer, one fans the pillow and mat to make them cool. In high antiquity, none of these etiquettes existed).