The top is rough, and the bottom is conscientious' (Even if the surface is a disaster, the inside should be in a polite way) (YAMANOUE no Soji ki (book of secrets written by YAMANOUE no Soji, best pupil of SEN no Rikyu, a great tea master)).
「上をそそうに、下を律儀に（表面は粗相であっても内面は丁寧に）」（山上宗二記）。