The greatest way we can fight sin is with the word of God.  However, we are prone to rely on ourselves and try to handle our struggles all on our own.  Becoming hard-pressed by temptation often leads us to isolate ourselves spiritually, emotionally, and at times physically.  While there are times for great solitude, fighting sin is not one of those times.  In his epistle, James calls us to fight sin together:

Therefore, confess your sins to one another and pray for one another, that you may be healed.  The prayer of a righteous person has great power as it is working (James 5:16 ESV).

The writer of Hebrews encourages this type of community as well:

And let us consider how to stir up one another to love and good works, not neglecting to meet together, as is the habit of some, but encouraging one another, and all the more as you see the Day drawing near (Hebrews 10:24-25 ESV).

And lastly Paul exhorts us to bear each others burdens in fighting sin:

Brothers, if anyone is caught in any transgression, you who are spiritual should restore him in a spirit of gentleness.  Keep watch on yourself, lest you too be tempted.  Bear one another’s burdens, and so fulfill the law of Christ (Galatians 6:1-2 ESV).

This clip from Planet Earth made me think of what this should look like in our lives.  Let’s fight together the way these otters do! (Start at 2:29 for illustration)