Positive teachers depend on the Holy Spirit for their empowerment. Their love and patience are motivated by their obedience to the Biblical commands to love God and to love thy neighbor as thyself. It takes a forgiving and determined spirit, a short memory, and a lot of prayer to consistently maintain a positive attitude. It also helps to have a sense of humor. If you make a mistake, laugh at yourself.
Teachers are human, and humans make mistakes.
Laughter shows your students that you accept yourself for who you are, regardless of your mistakes and faults. Their moody and sulky demeanor is displayed in inconsistency, self-pity, and offenses. Negativism, depression, and sulkiness will discredit a teacher, especially a Christian teacher. It demeans the spirit of Christian education, the professional and Christian ethics of the teaching profession, and the spiritual maturity expected of a Christian teacher. Negativism destroys teaching effectiveness.