If any human being is *sincere and willing* to *believe the sound/unadulterated gospel of Jesus Christ*;
His/her old self/flesh/human-will which can produce *righteousness or unrighteousness is dead*
This our dead old-flesh/self/human-will is *replaced/exchanged* with a new life; Jesus Christ Crucified(God and Man inseparable) in the same *mortal-body* that used to contain or carry our old-self.
This new life of Jesus Christ which has human attributes and Godly attributes begins to live inside our mortal-bodies growing from baby-Christian to youth-Christian then to adult-Christian just like Jesus Christ when he was inside his own mortal-body from conception till ascension without sin while facing trials, temptations, pleasures and enjoyments of human living.
The only thing that Jesus Christ who is God and Man inside our mortal bodies can produce is *righteousness* because he did not produce any sin inside his heart or in his body while on earth hence it is not *our righteousness* but the righteousness of Jesus Christ (2 Cor.5:21) which we cannot boast about because it is an unmerited reality(work of God's grace) within us
hence anybody who is *genuinely saved/born-again/believer/Christian/Disciple of Jesus Christ will produce fruits of the Holy Spirit (Gal.5:22-23) consistently without sin till the second coming of Jesus Christ or biological death*
but anybody still in the flesh will be producing the fruits of the flesh{Gal.5:19-21}
There is no human being that is permitted to produce these two different fruits
thus
"What is born of the flesh will produce fleshly fruits while what is born of the Spirit will produce fruits of the Holy Spirit"
(John 3:6)
"No one is able to serve two masters, for either he will hate the one and he will love the other, or he will be devoted to the one and he will despise the other. You are not able to serve God and mammon." {Matthew 6:24}
Great Grace Brethren!!!