The role of a teacher is to engineer student success. Teachers can only give what and who they are themselves. You may be the only stable adult your students will ever see in their lifetime. You may be their only hope and dream for a brighter tomorrow. Each person has unlimited potential.
Humans are the only species able to improve the quality of their lives.
You can have your achievements or you can have your excuses. You are the only person on the face of the earth who can use your ability. It is an awesome responsibility. The most important factor to a professional is the quality of the work and the commitment to the craft. I believe that every teacher can be effective.