My favorite would have to be 1Tim 1:13,15-16
Even though I was once a blasphemer and a persecutor and a violent man, I was shown mercy because I acted in ignorance and unbelief. Here is a trustworthy saying that deserves full acceptance: Christ Jesus came into the world to save sinners- of whom I am the worst. But for that very reason I was shown mercy so that in me, the worst of sinners, Christ Jesus might display his unlimited patience as an example for those who would believe on him and recieve eternal life.