You are witnesses, and so is God, of how holy, righteous and blameless we were among you who believed. For you know that we dealt with each of you as a father deals with his own children, encouraging, comforting and urging you to live lives worthy of God, who calls you into his kingdom and glory.
1 Thessalonians 2:10-12
If you walk around town with a hundred bill in your pocket and never use it for what it was intended for, than all you have is a piece of paper. A very valuable piece of paper, but never the less just a piece of paper until its used, only then does it utilize its purchasing power.
We as Christians also have a value consigned to us by God. But until we live our lives for the purposes God intended our existence is meaningless, valuable yes, but not useful. A Christian life not used for its purposes is a life not well spent.