Suppose there’s a dog carrying a piece of meat in his mouth as he walks alongside a lake. He turns to look at the lake’s surface, and he sees the reflection of the meat in the water. He opens his mouth and snaps at the reflection of the meat, losing both the meat and the reflection in the process.
In order to become a Christian, one needs to cling to ‘what Jesus has done’, just as the dog clings to the meat. And if they do, it will be reflected in their life, just as the meat was reflected in the lake.
However many misunderstand the message of Christianity, and rather than cling only to ‘what Jesus has done’ (the meat), they feel the need to cling also to their ‘good works’ (the reflection). And by trying to place their faith in ‘what Jesus had done’ as well as their ‘good works’, they lose both ‘what Jesus has done’ and their ‘good works’.
The key to becoming a Christian is to cling only to ‘what Jesus has done’ on our behalf. If we do, the Holy Spirit will come into our life and transform us from the inside out. So that when others see us they will see a reflection of Jesus.
(Based on an explanation by Martin Luther in his book ‘The Freedom of a Christian’. The story of the dog is one of Aesop’s Fables and is numbered 133 in the Perry Index)