" The commentaries usually mention nine kinds of internal formations: desire, hatred, pride, ignorance, stubborn views, attachment, doubt, jealousy, and selfishness. Among these, the fundamental internal formation is ignorance, the lack of clear seeing. Ignorance is the raw material out of which the other internal formations are made. Although there are nine internal formations, because “desire” is always listed first, it is often used to represent all the internal formations. "

― Thich Nhat Hanh , Our Appointment with Life: Discourse on Living Happily in the Present Moment