You're saying that the Law changes one's heart, yes?
Where in the Scriptures do you find that Law changes the heart for the good?
-JGIG
The Law does not change our hearts, no. Only God does that by placing a new heart within us, a heart having been imbedded with the Law. The Law is the 'to desire' of that new heart, seeing that the Law expresses God's will and seeks to fulfill that will. But, the only thing missing from that is the 'to accomplish that which is good'. So, God has given us His Spirit to 'to accomplish that which is good. And that Spirit comes with a new Law and that new Law is: DO LOVE.
Where in Scripture (from personal study).......
KJV Rom 7:21 I find then a law, that, when I would do good, evil is present with me.
Textus Receptus Rom 7:21 ευρισκω
G2147 V-PAI-1S - (I find) αρα
G686 PRT - (then) τον
G3588 T-ASM νομον
G3551 N-ASM - (the Law) τω
G3588 T-DSM θελοντι
G2309 V-PAP-DSM - (is the thing within desiring) εμοιG
1473 P-1DS - (in me) ποιειν
G4160 V-PAN - (to do) το
G3588 T-ASN καλον
G2570 A-ASN - (the thing which is virtuous
(good/worthy for usage)(as compared to G18 : intrinsically good)) οτι
G3754 CONJ - (because) εμοι
G1473 P-1DS - (in me) το
G3588 T-NSN κακον
G2556 A-NSN - (that evil
(intrinsically so)) παρακειται
G3873 V-PNI-3S - (evil is present)
Translated :Rom 7:21 I then find the Law is the thing within me
24 desiring to do the thing which is virtuous
(good/worthy for usage)(as compared to G18 : intrinsically good) because
25that evil
(intrinsically so) is present in me,
24 the Law is...within me = KJV: I find then a law. KJV omits the verb 'is willing' and the pronoun 'me' and its dative and the definite article attached to 'Law'. Including those things, it would be: The Law desiring within me. It was God who said that He would write His Law upon our hearts. That being so, then His Law, that is, the Law is within us. If you would, take note that the verb 'is willing' is pointing to the definite article which is in the dative. And that dative is telling us what state the Law is in, and that is 'within me'. Remember, the Law is not dead, it is written upon our hearts and v24 tells us that we serve God's Law with our minds, but with the flesh, we serve that same Law by which sin leads to death. And thus, the mandate to die to the flesh and become alive to our spirit.
25 because = when evil is present in you, it causes the Law to struggle against it and causes you to desire to do that which is good.