The explanation of the FOUR basic principles

Shaykh al-'Allaamah 'Abdul-'Aziez bin 'Abdillaah bin Baaz: "These four basic principles which the author Shaykh Muhammad bin 'Abdil-Wahhaab, may Allah have mercy upon him, has highlighted, are most important basic principles. Whoever understands these basic principles well, has correctly understood the religion of the polytheists and the religion of the Muslims. And the majority of creation does not understand these basic principles; hence, matters are unclear to them. Because of this, they have worshipped graves alongside Allah, those who inhabit these graves, the awliyaa', trees and stones, while they think that they are engaged in something good due to their ignorance regarding the reality of tawheed and the reality of idolatry.