1 Timothy 1:8

Indeed, I know that the law is an excellent thing, if a man makes a lawful use of it;

Romans 7:16

But if I am always doing what I do not want to do, I agree that the law is right.

Romans 7:12-13

So the law itself is holy, and its specific commands are holy, right, and good.

Romans 7:18

For I know that nothing good has its home in me; that is, in my lower self; I have the will but not the power to do what is right.

Romans 7:22

For in accordance with my better inner nature I approve God's law,

Romans 12:2

Stop living in accordance with the customs of this world, but by the new ideals that mold your minds continue to transform yourselves, so as to find and follow God's will; that is, what is good, well-pleasing to Him, and perfect.

Galatians 3:21

Is the law then contrary to God's promises? Of course not. For if a law had been given that was able to impart life, surely, then, right standing would have come through law.

2 Timothy 2:5

No contestant in the games is crowned, 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 itself is holy, and its specific commands are holy, right, and good.
Romans 12:2
Stop living in accordance with the customs of this world, but by the new ideals that mold your minds continue to transform yourselves, so as to find and follow God's will; that is, what is good, well-pleasing to Him, and perfect.
Galatians 3:21
Is the law then contrary to God's promises? Of course not. For if a law had been given that was able to impart life, surely, then, right standing would have come through law.

Lawfully

2 Timothy 2:5
No contestant in the games is crowned, unless he competes according to the rules.