This was said by the Buddha, the Perfected One: that is what I heard.

“Mendicants, I do not see a single shroud, shrouded by which people wander and transmigrate for a long time like the shroud of ignorance. Shrouded by ignorance, people wander and transmigrate for a long time.”

The Buddha spoke this matter. On this it is said:

“There is no other thing 
that shrouds people like ignorance. 
Veiled by delusion, 
they transmigrate day and night.

Those who have given up delusion, 
shattering the mass of darkness, 
wander no more, 
the root is not found in them.”

This too is a matter that was spoken by the Blessed One: that is what I heard.