All faith is uniquely personal for the individual believer.
It's odd that you focus on ink there.
Whereas before it was , it is the words ten commandments , that you claimed don't apply to the New testament and now while closing your remarks,opinion, above with a Bible verse thats written in ink.
I think when someone argues against God's laws being relevant,because they're in ink,yet insists those laws are now written in our heart,that they're missing the point.
God's laws ,the ten commandments,were first written by God in stone.
Metaphorical, also besides that fact. Because that was meant to tell his faithful,they are eternal and irrevocable.
Just like the free grace gift later on , in God's seal and eternal Salvation of the individual believer.
God's Ten Commandments was never written with ink- it was written by the finger of God, the Spirit of the living God on stone. Exo31:18 Deut4:13
Ink is what man wrote with in scrolls.