Which ethics will lead your morals to decide on the best choice? This book shows that the ethical stance of the teacher interferes with the behaviour of the students, emphasising the main reasons why there is an urgent need to rethink the practice of ethical values in the classroom, showing that omission generates a state of inattention to the school community, with the risk of leaning towards indifference in the act of teaching, that is, wasting the noblest potential of the human being, which is their capacity to think and create, to grow and develop, generating the deconstruction of knowledge, intellectual poverty, accommodation, indiscipline, segregation, intolerance, irresponsibility, fraud, etc. On the other hand, the continuous development of ethical conduct, desired in various professions, enhances the construction of knowledge, new knowledge, innovation, discipline, empathy, acceptance, tolerance, etc., providing a product (people) that meets the demands of the labour market, with an ethically correct attitude. The book also covers the origins and differences between ethics and morals, unethical and unethical, and the purpose of the professional code of ethics.