The first time by sending His Son to die on a cross for me, to pay a debt I owed but I could never pay, forgave me of everything I'd ever done wrong my whole life, threw my sins as far away as the east is from the west.
And then over and over and over He continues to show me mercy day after day after day. I learn of circumstances He delivered me out of, He sees to my family's needs, He speaks to me who as Paul said is the chief of all sinners.. there IS NO END to HIS mercy. It is limitless. Infinite. Amazing love. How can it be?