That someone has gone to college and perhaps even earned a postgraduate degree in education does not mean he is or will be a good teacher.  The measure of a good teacher is found in the results he sees in his students. Also, the attitude towards teaching, the school in which one teaches,students and parents will greatly affect those results.   
Their attitude must be positive. The teacher must approach education is doing will affect the world. They must have an attitude of belief in theirthe natural ability in learning of their students.   .Their attitude must be one that is open to continuous and
constantly be learning more about the subjects that they teach with a belief that what he students regardless of then ever-ending learning;.  Teachers must      And even if a teacher is a history teacher (not too many current events when studying, say, ancient history) they need to stay up-to-date on any current discoveries that perhaps haven't been known in the past. For example, in the USA, there has been a long held belief that Christopher Columbus " discovered"
America. However, many are refuting (驳斥) the so-called "facts" today basing on new findings.
   The farmer doesn't expect a harvest to appear immediately after he plants the seeds. He does, however, "see" the harvest in his mind. The same is necessary for the teacher.They know the harvest will come but today is a day to plant seeds and cultivate the crop, which can't be achieved within days.
Their attitude must be one of perseverance. It's not always easy or fun to be a teacher.           Much of a teacher's stress comes from having to deal with the administration of schools,and facing students of different characters. It can be a pain sometimes.
Teaching is a "calling", not just a vocation.  You must have the vision to look into your students' eyes and see their futures.  Not only is teaching an investment in children's lives, but, it is an investment in the future of our world. Therefore, it is rewarding.

A．There are times when it is difficult.

B．Their attitude must be one of patience.

C．Here are some attitudes of great teachers.

D．Those who take a negative attitude can't make it.

E. Here are some suggestions about how to be a great teacher.
F. Their attitude must be one of investments in children's lives.
G. They need to be reading the latest discoveries in their field.