Attitude or belief that contains 'should' or 'ought' aspect is called -

Value

Values are attitudes or beliefs that contain a ‘should’ or ‘ought’ aspect, such as moral or ethical values. One example of a value is the idea that one should work hard, or that one should always be honest, because honesty is the best policy. Values are formed when a particular belief or attitude becomes an inseparable part of the person’s outlook on life. Consequently, values are difficult to change.