cont... "righteousness of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit."
Then also consider James 2:10 For whosoever shall keep the whole law, and yet offend in one point, he is guilty of all.
You are however right that Yeshua did not "change the Law" with regards to Adultery or Homosexuality or Fornication, He pointed out that those who wanted to condemn and justifiably so within the context of the Law had to look further within themselves as to their "holiness before casting their stone." Yeshua could have case His stone, but he came to save sinners, even within their own sins. maybe we should do likewise?!