A chair in a dream can point to status -- who holds a position of authority, or who's missing from one. An empty chair often reflects someone absent from your life whose presence you still feel, while sitting and waiting in one can mirror a decision you're putting off making.
Mercury in the sixth house of a nativity, the native shall change from one religion to another, & will have his felicity in part impedited by reason of his inconstancy. - William Lilly (1602.-1681.)