I'm working on a new concept to me. It's not totally formed yet, but I want to write the beginnings of it as I begin to work it out.
The root of the word "mercy" is "exchange." So, when I say "Lord have mercy," I'm saying exchange this for that. Exchange this problem for Your will.
When I take the bread and the wine, God's mercy is an exchange. I exchange my separate, isolated self for joining with Christ. Let the mind be in you that is in Christ Jesus is the exchange I approach. It seems to be a process, that is the first time or the twentieth time or the two hundredth time is not the when this happens. It slowly, for most of us anyway, sort of creeps in. When we sincerely seek mercy, we move toward having the understanding of Christ express in us.
We can look to those who have successfully made this exchange to varying degrees -- from the Apostles, to the mystics, to saints, to great thinkers such as C.S. Lewis (I quoted him today on my website's Thought for the Day). If it is possible for one, it is possible for all.
Lord, I sincerely, fully say to You this day, have mercy on me. Exchange all that is unlike Christ for Christ. In the exchange, let Your Light shine & draw others to You for their own exchange. Let Your Light shine in people all over this planet. Lord, have Mercy.