2 Samuel 18:5-7
"And Joab came into the house to the king, and said, Thou hast shamed this day the faces of all thy servants, which this day have saved thy life, and the lives of thy sons and of thy daughters, and the lives of thy wives, and the lives of thy concubines; In that thou lovest thine enemies, and hatest thy friends. For thou hast declared this day, that thou regardest neither princes nor servants: for this day I perceive, that if Absalom had lived, and all we had died this day, then it had pleased thee well. Now therefore arise, go forth, and speak comfortably unto thy servants: for I swear by the LORD, if thou go not forth, there will not tarry one with thee this night: and that will be worse unto thee than all the evil that befell thee from thy youth until now.
Proverbs 29:8a
"Where there is no vision the people perish..."
David's mourning not only confused his followers, but also discouraged them. Risking life and limb they had fought for David. They had won a great victory but instead of gladness they saw sorrow and regret from their leader.
As Christians we are all to be leaders, leading the lost to Christ, leading our brothers and sisters in Christ to know Him better. As Paul said, follow me as I follow Christ. A good leader though must look ahead, not back.
In David's regret of the past his followers almost all left him. Do I look back on my past with regret? Do I regret having to forsake my sin? Do I miss the wickedness of my past? Sin is always that well dressed corpse and in hindsight it appears beautiful and alluring.
We cannot ever think of ourselves alone. Think of those who are following you. There are people you may not even realize are following you, using you as an unknowing example. What result will my actions have on them? Where am I leading? Am I leading forward with purpose and vision? Or standing still in regret?