http://bible.com/111/2TH3.3 But the Lord is faithful, and he will strengthen you and protect you from the evil one.
In life many times we feel like we can handle our sins. And we tell ourselves all I need to do is make this adjustment and I can change. The truth is the only one that can protect us from the devil and his schemes is God. If we study the bible and see all the great men and women from Adam to Paul. All of them struggled with sin and relied on God to cover their shortcomings. So don’t think you have to change on your own, come to God broken and he will fix you.
I hope this helps,