William Blake's "Auguries of Innocence" Stanza Response

The questioner, who sits so sly,
Shall never know how to reply.
He who replies to words of doubt
Doth put the light of knowledge out.

I think this stanza means that those who don't take a chance on how to respond to something new, a certain situation, or a question, will stay in doubt. On the other hand, those who respond with doubt will learn from it whether or not their response was right because they tried.

William Blakes uses the literacy device, Imagery, because he describes how the questioner is sitting and creates a sense that the questioner is careless or worried. Blakes also creates a mental image of a thinking light bulb when he says that the light of knowledge is put out.