Categories of Ghuloo (extremism) and its evils- Shaykh Ibnul-’Uthaimeen rahimahul-llaah
Ghuloo (extremism) can be in the following:
1-In creed: some people went extreme in affirming the attributes to Allaah like the Mumathilah (likening) and some people went extreme in exalting like the Mu’attilah (rendering attributes void).
2-In acts of worship: some people went extreme and exceeded the boundaries like those who make ablution four times, and some neglected the permissible like those who wipe the limb which they should wash.
3-In transactions: some people went extreme and prohibited the contracts or its conditions that Allaah made lawful, and some went neglected and made lawful contracts and its conditions that Allaah made unlawful.
Evils of Ghuloo (going extreme in creatures):
1-Dwelling the person above his due status if it is a praise and below his due status if it is a criticism.
2-It leads to worshiping him/it.
3-It hinders glorifying Allaah the exalted.
4-It corrupts the person whom people went extreme in if he is present; if it is a praise it leads him to vanity and self-amazement, and it leads to enmity and rancour if it is a criticism.
Source: Al-Fawaa’idul-Muntaqaah min Sharhi Kitaabit-Tawheed lish-Shaykh Muhammad bin Saalih Al-’Uthaimeen rahimahul-llaah by Alee bin Mirshood Ar-Rumaihee p19-20.