Our Spiritual Battles

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David sent out Joab in His place for battle (1 Chronicles 20:1) and stayed home instead of going to war (2 Samuel 11:1). He quickly ended up entangled with Bathsheba (2 Samuel 11:2-3).
For a while, David added sin upon sin. 

One lesson we can take away: When we avoid the spiritual battle that is our duty to fight, we may end up in a battle we haven't planned for.

Finally, be strong in the Lord and in the strength of his might.  Put on the whole armor of God, that you may be able to stand against the schemes of the devil. For we do not wrestle against flesh and blood, but against the rulers, against the authorities, against the cosmic powers over this present darkness, against the spiritual forces of evil in the heavenly places.  Therefore take up the whole armor of God, that you may be able to withstand in the evil day, and having done all, to stand firm. (Ephesians 6:10-13 ESV)