Yisrael Meir Kagen, Mishna Berura · משנה ברורה — Orach Chaim · אורח חיים…
“ For a person's way of sitting, his movements and his dealings while he is alone in his house are not like his way of sitting, his movements and his dealings when he is before a great king; nor are his speech and free expression as much as he wants when he is with his household members and his relatives like his speech when in a royal audience. ”
