It is a subject. That is because "to play with matches" denotes the act of playing with matches and this act conducts the action of being wrong. Therefore, it is a subject that does the action.
ok its a quote so what to do with this question ?????
Answer:
A characteristic of a strong theme would be a moral.
Explanation:
You need to have a common moral, like don't take things for granted, or not to lie. Honestly, if it represents a lesson you can learn in life, easy or hard way, then it is a strong characteristic of a good moral, or theme.