Inordinate ambition and inordinate competition are also mental attitude sins. There's nothing wrong with ambition or competition but when a person is obsessed with them, there's everything wrong. They're always competing and comparing with others. It is a lust that drives people crazy. Fear is a whole system of sins which include worry, anxiety, insecurity, incapability of doctrinal application, and therefore inability to use the problem solving devices.
Fear is an emotional sin and it torments the lives of others.
Mature believers are not afraid. For the believer who lives in a state of fear, the fear increases like a disease. As the cancer of fear grows, that individual becomes intimidated by life. Guilt can be a devastating thing if it's not handled properly. When we fail in some facet of our life, sooner or later we have to move on.