1 Timothy 1:8

But we know that the law is good, if any one use it lawfully;

Romans 7:16

If, then, I do that which I wish not to do, I give assent to the law, that it is good.

Romans 7:12-13

Therefore, the law is holy, and the commandment, holy and just and good.

Romans 7:18

For I know that in me, that is, in my flesh, dwells no good; for to will is present with me; but to perform that which is good, I find not.

Romans 7:22

For, in the inward man, I delight in the law of God:

Romans 12:2

And be not conformed to this age, but be transformed by the renewing of your mind, that you may learn what the will of God is the good, and the acceptable, and the perfect.

Galatians 3:21

Is the law, then, against the promises of God? It can not be. For if a law had been given which could have given life, surely righteousness would have been by law.

2 Timothy 2:5

And if any one also contend in the public games, he is not crowned, unless he contend according to the laws.

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
Therefore, the law is holy, and the commandment, holy and just and good.
Romans 12:2
And be not conformed to this age, but be transformed by the renewing of your mind, that you may learn what the will of God is the good, and the acceptable, and the perfect.
Galatians 3:21
Is the law, then, against the promises of God? It can not be. For if a law had been given which could have given life, surely righteousness would have been by law.

Lawfully

2 Timothy 2:5
And if any one also contend in the public games, he is not crowned, unless he contend according to the laws.