A person who enters teaching because of an overwhelming love of a certain subject matter (e. g., art, history) must guard against

When we talk about something we love we are very passionate about it, but it is important to know and remember that not everyone is passionate as us about the things we love. That is why those who teach the subjects they love must have patience for those who do not have the same passion for the subject as the teacher does. This is very important because if the teacher is impatient with those students there is no way that he will be able to share his passion of the subject with them.