Very nice your post and your post picture is awesome and you are doing a great duty as a teacher very nice teaching duty is really a great duty why it gives knowledge to people and there is no need to cheat or be stingy and People can understand the joy of imparting knowledge to people by attaining teaching and self-acquired knowledge is surely good when it is given to others' love and if someone can achieve great things in life by taking knowledge from you, it will be your achievement and yours. Be proud of it