What is notable about لَا حَوْلَ وَلَا قُوَّةَ إِلَّا بِاللَّهِ in this lesson?

Negating an Entire Class with لَا

• لَا occurs twice, and each occurrence begins the same class-negating pattern
• The sentence contains no noun after لَا
• Both occurrences of لَا turn the sentence into questions