There are two ways to show your library permanently in the Finder
How does this work?
Navigate to the home directory
Press now the following button ⌘ ↑ H
The window opens with the home directory (this is the house icon)
Click on the house and press following button ⌘ H
Another window opens
Set a hook at the Library folder and say okay.
It can be that after a restart the folder is gone in Finder. Repeat the steps and set the hook again and confirm, I think under Sierra is currently a small bug when the folder dont show up.