Essays / Arguments for a Persuasive Essay (quote by Browning) [4]

I need to write an essay on whether I agree or disagree with a quote.
The quote I've chosen is "Ignorance is not innocence but sin." (Robert Browning), and I am disagreeing with the quote.

So far my ideas are: As a first point, to define sin, that sin is an act against ones morality and that ignorance could cause a sin,

but could not be a sin and so it's innocence.
Second point, ignorance is not a sin unless one willfully chooses to be ignorant.

Are my two points strong? And any suggestions to what I could write as a third point? Any help or advice will be greatly appreciated.

Thank you.