The cup will be clean in inside, if we love also our enemy.
We have to bend our selves away from our old selfish, bad nature, with prayers, for God, and of course we have to reborn above, and when we reborn above we do not serve sin anymore, but righteousness.
I think this sounds very much like the message of Romans 7:17 - 8:17....
Rom 7:17-8:17
17) Now then it is no more I that do it, but sin that dwelleth in me.
18) For I know that in me (that is, in my flesh,) dwelleth no good thing: for to will is present with me; but [how] to perform that which is good I find not.
19) For the good that I would I do not: but the evil which I would not, that I do.
20) Now if I do that I would not, it is no more I that do it, but sin that dwelleth in me.
21) I find then a law, that, when I would do good, evil is present with me.
22) For I delight in the law of God after the inward man:
23) But I see another law in my members, warring against the law of my mind, and bringing me into captivity to the law of sin which is in my members.
24) O wretched man that I am! who shall deliver me from the body of this death?
25) I thank God through Jesus Christ our Lord. So then with the mind I myself serve the law of God; but with the flesh the law of sin.
1) [There is] therefore now no condemnation to them which are in Christ Jesus, who walk not after the flesh, but after the Spirit.
2) For the law of the Spirit of life in Christ Jesus hath made me free from the law of sin and death.
3) For what the law could not do, in that it was weak through the flesh, God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh:
4) That the righteousness of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit.
5) For they that are after the flesh do mind the things of the flesh; but they that are after the Spirit the things of the Spirit.
6) For to be carnally minded [is] death; but to be spiritually minded [is] life and peace.
7) Because the carnal mind [is] enmity against God: for it is not subject to the law of God, neither indeed can be.
8) So then they that are in the flesh cannot please God.
9) But ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you. Now if any man have not the Spirit of Christ, he is none of his.
10) And if Christ [be] in you, the body [is] dead because of sin; but the Spirit [is] life because of righteousness.
11) But if the Spirit of him that raised up Jesus from the dead dwell in you, he that raised up Christ from the dead shall also quicken your mortal bodies by his Spirit that dwelleth in you.
12) Therefore, brethren, we are debtors, not to the flesh, to live after the flesh.
13) For if ye live after the flesh, ye shall die: but if ye through the Spirit do mortify the deeds of the body, ye shall live.
14) For as many as are led by the Spirit of God, they are the sons of God.
15) For ye have not received the spirit of bondage again to fear; but ye have received the Spirit of adoption, whereby we cry, Abba, Father.
16) The Spirit itself beareth witness with our spirit, that we are the children of God:
17) And if children, then heirs; heirs of God, and joint-heirs with Christ; if so be that we suffer with [him], that we may be also glorified together.