The Bible addresses our efforts to please Him in our flesh: “For they being ignorant of God’s righteousness, and going about to establish their own righteousness, have not submitted themselves unto the righteousness of God” (Romans 10:3). Trying to establish our own righteousness is actually our flesh at work!
Trying to please God in our human power robs us of our joy and peace with Him. Any victories will be short-lived and we will fall into temptation again. The enemy will keep harassing us and a conversation with him might go something like this:
Satan whispers, “What about the sin you indulged in just yesterday? You are guilty!” 
“No,” you answer, “I’ve already asked forgiveness for that. It’s all under the blood and I’ve asked God to make me hate that sin to keep me from doing it again.”
“But you are still tempted.”
“True, but Jesus made a way of escape for me. His Word says I will be able to bear the temptation and He will deliver me” (see 1 Corinthians 10:13).
Satan persists, “There are still unsettled issues in your life.”
When the accuser brings up “unsettled issues” — some war that still rages within you — you can answer with this passage of Scripture: “And you, that were sometime alienated and enemies in your mind by wicked works, yet now hath he reconciled in the body of his flesh through death, to present you holy and unblameable and unreprovable in his sight” (Colossians 1:21-22).
Even when we fail Him, God loves us; He seeks us out and reconciles us to Himself. He loves us even when we struggle and through Christ He makes us to be at peace with Him.