What is this Ignorance - The very root of all Suffering ?

What is this Ignorance - The very root of all Suffering ?

At Baranasi in the Deer Park at Isipatana, they once asked Sariputta:
Ignorance, ignorance, it is said, what now, friend, is this
ignorance, and in what way is one immersed in such ignorance???

[Sariputta said]: Here, friend, the uninstructed ordinary person does
not understand [the following] as it really is: neither the arising,
nor the ceasing, nor the satisfaction, nor the danger, nor the
escape, nor the way leading to escape, neither in the case of form,
nor in the case of feeling, nor in the case of perception, nor in the
case of mental construction, nor in the case of consciousness.

This, friends, is called ignorance, and in this way is one indeed
still immersed in the blindness of ignorance...

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Source:

The Grouped Sayings by the Buddha. Samyutta Nikaya 22:131+5 III 174-6

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http://www.accesstoinsight.org/canon/samyutta/index.html