They won’t read, they will kick in the “correct” thoughts.

Context. If you do it in your home then it’s probably light or worship. If you do it in public it’s a commentary on certain global events. What kind of commentary also depends on more context, it could be either a show of support or hostility to Israel. What you are saying at the time, location, your previous public statements all contribute to interpretation.

Idk if you can get any reasonable amount of heat from a candle.