1Tim 1:8 Law can be Good
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1Tim 1:8 But we know that the law is good if one uses it lawfully
To use it lawfully is to interpret and apply it using proper Biblical hermeneutics (principles of interpretation). For example twice Paul utilizes Deut 25:4 "You shall not muzzle an ox while it treads out the grain." This he applies as affirming the idea that one who preaches the gospel has a right to get paid for it. (1Cor 9:9; 1Tim 5:18) But he also backs this up with the explicit teaching of the Lord by saying, "Even so the Lord has commanded that those who preach the gospel should live from the gospel." 1Cor 9:14, which is in line with what was practiced.
Another example is in Mark 10 concerning the subject of divorce, Jesus utilized verses in the first book of the Law to reveal the most fundamental principles concerning marriage from its very inception, which the Pharisees hadn't taken into account in their literal application of other verses from the Law.
Thus Law of Moses has relevance to the Christian life, as long as it is applied properly and consistent with New Testament principles.