The law that those making them need abide by them as well.
if you only had one book of the Bible to keep and use, which would it be?
how about this, if there is only one verse I can ever know, or lay eyes on, or memorize, and I never have the opportunity to even hear of another bible verse
the one verse is 1 John 5:11 - this is the testimony, God has given us eternal life, and this life is in his Son.
if you read 1 John 5:12, I hope you understand my choice of bible verse for this
and this is just to "put it in perspective" trusting that Romans 10:17 helps, etc.