Philippians 3.13,14 is familiar to most, "...But one thing I do: forgetting what lies behind and straining forward to what lies head, I press on toward the goal for the prize of the upward call of God in Christ Jesus."
In a culture where "unlocking the secrets of your past" still runs rampant, Christians need to let the confessed stuff stay behind.
We can....with the help of the Spirit...leave the "stuff" behind...but not the lessons (hopefully) learned.
Don't jazz up your testimony by going into detail about past failings. Though it may entertain the audience, it may bring you back to temptation and then to a falling of some type.
Don't lose the "lessons (painfully) learned." Don't think you've grown beyond the possibility of caving to temptation.
Half of being smart is knowing what you are dumb at.
Know the areas of weakness evidenced in "stuff" of the past. But do not dwell on the stuff, focus on the raise to be run..strain forward, press toward ...don't lean backward.