Let's be the person that wakes up and says, "It's a good thing God's mercy is new every morning, because I used up all of yesterday's supply!" Webster's Dictionary defines mercy as "tenderness of heart that disposes a person to overlook injuries or to treat an offender better than he deserves." That's a picture of God's mercy toward you!
I need to bring to mind this awesome truth about His mercy's towards me daily. Listen to what the Scripture says in Lamentations 3:19-23, "O Lord, I remember my affliction and my misery, my wondering and my outcast state... My soul has them continually in remembrance and is bowed down within me. But this I recall (Boot up in my mind) and therefore have I hope and expectation; It is because of the Lord's mercy and loving-kindness that we are not consumed, because His tender compassion fail not. They are new every morning; great and abundant is Your stability and faithfulness. (Amplified Bible)
David was a man who loved God very much, yet lust overcame him causing him to commit adultery, then had the woman's husband killed. The reason David talked about God's mercy is because he radically needed so much of it! Only a person who's gut-level honest in their evaluation of themselves can say, "Oh give thanks to the Lord, for He is good; for His mercy and loving-kindness endure forever" (Ps. 107:1 Amp).
If you think you're responsible for your success, think again. Paul, a very anointed Apostles wrote; "I know that in me (that is, in my flesh) dwelleth no good thing" Romans 7:18. It's impossible to be merciful until we've thoroughly come to terms with our own need for mercy and learned to receive it from the Lord. Then we can give it away and show mercy to others. The truth is, if any of us were "perfect," nobody could stand us, because we'd expect the same of others. Every time we have a memory lapse and forget - concerning our own faults, we end up being hard to live with. At such times the Holy Spirit reminds us again of our flawed condition. He allows us to get into just enough trouble to need His mercy, to keep us humble, and therefore become lover's of mercy and useable.