”For what I am doing, I do not understand. For what I will to do, that I do not practice; but what I hate, that I do.  If, then, I do what I will not to do, I agree with the law that it is good.  But now, it is no longer I who do it, but sin that dwells in me.  For I know that in me (that is, in my flesh) nothing good dwells; for to will is present with me, but how to perform what is good I do not find.  For the good that I will to do, I do not do; but the evil I will not to do, that I practice.” (Romans 7:15-19)

For the sinful nature desires what is contrary to the Spirit, and the Spirit what is contrary to the sinful nature. They are in conflict with each other, so that you do not do what you want.”  (Galatians 5:17) NIV

For the flesh lusts against the Spirit, and the Spirit against the flesh; and these are contrary to one another, so that you do not do the things that you wish.” (Galatians 5:17  (NKJV)