1 Timothy 1:8

But we know that the law of Moses is good if a person uses it properly.

Romans 7:16

But if I do what I do not want to, I agree with the law [which condemns such conduct] that it is good.

Romans 7:12-13

So, the law of Moses itself is holy and the commandment [against sinning] is holy and just and good.

Romans 7:18

For I know that nothing good lives in me, that is, in my flesh, for the desire to do good is present in my heart, but the ability to carry it out [consistently] is not.

Romans 7:22

For in my heart I am delighted with God's law,

Romans 12:2

And you people must not be conformed to [the values and standards of] this age, but you should become transformed [i.e., changed in attitude and action] by having your mind renewed [i.e., to think in a totally different way]. Then you will be able to determine [and practice] God's will, the thing that is good, and acceptable and perfect.

Galatians 3:21

Is the law of Moses contrary to the promises of God? Certainly not! For if there had been a law given which could provide [never ending] life, then a person could be considered right with God by [obeying the requirements of such] a law.

2 Timothy 2:5

And if a person competes as an athlete, he is not awarded the victor's crown unless he competes according to the rules.

Treasury of Scripture Knowledge

Summary

But we know that the law is good, if a man use it lawfully;

Lawfully

Bible References

The law

Romans 7:12
So, the law of Moses itself is holy and the commandment [against sinning] is holy and just and good.
Romans 12:2
And you people must not be conformed to [the values and standards of] this age, but you should become transformed [i.e., changed in attitude and action] by having your mind renewed [i.e., to think in a totally different way]. Then you will be able to determine [and practice] God's will, the thing that is good, and acceptable and perfect.
Galatians 3:21
Is the law of Moses contrary to the promises of God? Certainly not! For if there had been a law given which could provide [never ending] life, then a person could be considered right with God by [obeying the requirements of such] a law.

Lawfully

2 Timothy 2:5
And if a person competes as an athlete, he is not awarded the victor's crown unless he competes according to the rules.