Question

In her letter Annie wrote, "The more I think the more certain I am that _________ is the gateway through which knowledge enters the mind of the child."

Answer 1

Anne Sullivan, while describing her struggle to work with a young Helen Keller, wrote, "...the more I think, the more certain I am that obedience is the gateway through which knowledge, yes, and love, too, enters the mind of the child."

Answer 2

In her letter Annie wrote, "The more I think the more certain I am that "Obedience" is the gateway through which knowledge enters the mind of the child."

In short, Your Answer would be: "Obedience"

Hope this helps!