If we always seek to discover the truth and learn, we will thirst for knowledge. If teachers have no enthusiasm and zeal, they cannot make the students thirst for learning and knowledge.
Stagnation, being at a standstill, and despairing are the characteristics of immature humans. A successful teacher thinks about his own growth and dynamism first.
Self-criticism is the foundation for human progress. A successful teacher never feels that his/her teaching method is perfect. He/she examines the teaching methods and knows that there always are better methods, and one should distance him/herself from old-fashioned and ineffective methods as much as possible.