I hesitate to say the Law is no longer valid because we are "no longer under the Law, but the Spirit". The Law is God's righteous standard. What has changed was the method or angle of righteousness to obtain that standard. Before, it was by the power of the flesh: "do this and you shall live". Now, with the Spirit, we emulate the nature of the Law so that it is now written in our hearts by the power of the Spirit, but we still have to study God's Word.Since I have 6 cats, I always like to use the cat example. The Law says, if you are a cat, you will scratch like one, meow like one, and catch mice like one. So, here comes a bunch of people trying to act like cats to show they are cats. No, it does not work, and the description merely shown us we are not cats.Now..... suddenly we are changed into cats. Guess what? We meow like cats, scratch like cats, and catch mice like cats. The standard is the same..... but the nature of the beast so-to-speak has changed to accommodate the description, which is still the same.