1 Timothy 1:8

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

Romans 7:16

And if I do that which I would not, I consent to the law that it is good:

Romans 7:12-13

So that 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) dwelleth no good: for to will is present with me, but how to perform that which is good, I find not.

Romans 7:22

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

Romans 12:2

And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may experience what is the good, and acceptable, and perfect will of God.

Galatians 3:21

Is the law then contrary to the promises of God? not at all: for if a law had been given, which could have confered life, certainly righteousness would have been by the law.

2 Timothy 2:5

And if any one contend in the public games, he gains not the crown unless he contend fairly.

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 that the law is holy; and the commandment holy, and just, and good.
Romans 12:2
And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may experience what is the good, and acceptable, and perfect will of God.
Galatians 3:21
Is the law then contrary to the promises of God? not at all: for if a law had been given, which could have confered life, certainly righteousness would have been by the law.

Lawfully

2 Timothy 2:5
And if any one contend in the public games, he gains not the crown unless he contend fairly.