Authenticity is central to being comfortable with oneself, to being trusted by friends, and to being a leader. Authentic persons are objectively aware of their own strengths and weaknesses. Man sacrifices his health in order to make money. He sacrifices money to recuperate his health. He is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived. In teachers' classroom, authenticity leads to intrinsic motivation, which then leads to greater engagement. Psychologist Carl Rogers offered a good insight into authenticity. Every teacher has seen this happen: teacher spends hours making corrections on students' work, only to see identical mistakes on the next assignment. The result can lead to feelings of frustration and dismay.