Conversationalism: Shall we sin so that grace may abound?

You see this was me too, but no one seemed to be on to me
Acting like a church kid, while addicted to pornography
See on Sunday I’d go to church, but Saturday getting faded
Acting if I was simply created just to have sex and get wasted
See I spent my whole life building this facade of neatness
But now that I know Jesus, I boast in my weakness

(Jeff Bethke, in his video poem)

Now the law came in to increase the trespass, but where sin increased, grace abounded all the more, so that, as sin reigned in death, grace also might reign through righteousness leading to eternal life through Jesus Christ our Lord.

What shall we say then? Are we to continue in sin that grace may abound?

(Rom. 5:20-21; 6:1)

Christians ought to live godly lives. We are all sinners saved by grace alone. Yet, what is the nature of our testimony? What are we to make of Jeff Bethke’s idea of “boast[ing] in … weakness”?