In this parable the woman loses one silver coin and basically turns the whole house upside down to find it. When she has found it she goes and knocks on her neighbours doors and asks them to come and celebrate with her. Jesus goes on to say: "In the same way, I tell you, there is much rejoicing in the presence of the angels of God over one sinner who repents."
These three verses are sometimes a little overshadowed by the two losts either side of them. However a few things really struck me.
1) She lights a lamp. She sets off looking with the light shining so that she may see that glimmer of a reflection of light off the silver, even in the darkest of corners. This is how Jesus sets out for us. He is the light, and he came down to the dark corner of the world to look with hope for that glimmer of treasure God has placed in all of us.
2) She turns the house upside down. "Swept the house and searched carefully" doesn't convey how much she searched. She would have lifted heavy rugs, swept under solid wooden cupboards, maybe even on her hands and knees with the lamp, peering into the darkness. Jesus again went to great lengths for us. He came down to earth and was crucified on a cross, so he could burst open the gates of hell from the inside. All this to bring us to God.
3) When she finds the coin she has to go tell people and gather them to celebrate with her. Jesus says this shows how there is huge rejoicing in heaven over one sinner. You have to imagine this: a lot of noise, trumpets blowing, angels singing 'Holy, holy, holy' and lots of joy, and that's just over one sinner repenting. It blows my mind to think what the sound was like when Peter preached to the crowd and 3000 repented!
So remember, Jesus loves you so much that he come down, shone the light of heaven, searched the darkest depths, and then rejoiced when you came to Him.