Salvation is free, but that doesn't mean that we as Christians are off the hook.  Read this passage from Paul's letter to the Philippians.  Then, read it again, focusing on what it means to live "in a manner worthy of the gospel."  Pick out a few things you can specifically change in your life.  Ask God to help you make those changes.

Philippians 1:27 - 2:16 (NIV)

Whatever happens, conduct yourselves in a manner worthy of the gospel of Christ.  Then, whether I come and see you or only hear about you in my absence, I will know that you stand firm in one spirit, contending as one man for the faith of the gospel without being frightened in any way by those who oppose you.  This is a sign to them that they will be destroyed, but that you will be saved - and that by God.  For it has been granted to you on behalf of Christ not only to believe on him, but also to suffer for him, since you are going through the same struggle you saw I had, and now hear that I still have.

If you have any encouragement from being united with Christ, if any comfort from his love, if any fellowship with the Spirit, if any tenderness and compassion, then make my joy complete by being like-minded, having the same love, being one in spirit and purpose.  Do nothing out of selfish ambition or vain conceit, but in humility consider others better than yourselves.  Each of you should look not only to your own interests, but also to the interests of others.

Your attitude should be the same as that of Christ Jesus:

     Who, being in very nature God,
          did not consider equality with God something to be grasped,
     but made himself nothing,
          taking the very nature of a servant,
          being made in human likeness.
     And being found in appearance as a man,
          he humbled himself
          and became obedient to death --
               even death on a cross!
     Therefore God exalted him to the highest place.
          and gave him the name that is above every name,
     that at the name of Jesus every knee should bow,
          in heaven and on earth and under the earth,
     and every tongue confess that Jesus Christ is Lord,
          to the glory of God the Father.

Therefore, my dear friends, as you have always obeyed - not only in my presence, but now much more in my absence - continue to work out your salvation with fear and trembling, for it is God who works in you to will and to act according to his good purpose.

Do everything without complaining or arguing, so that you may become blameless and pure, children of God without fault in a crooked and depraved generation, in which you shine like stars in the universe as you hold out the word of life - in order that I may boast on the day of Christ that I did not run or labor for nothing.