OSX defaults to hiding the users Library directory within the file system in order to protect it from accidental deletion. Power users and hacker-types often find they need access to the Library in order to modify system preferences.
Un-hide the User /~Library folder
Launch the ‘Terminal’ from Spotlight or the Launchpad then enter the following command to unhide the directory:
chflags nohidden ~/Library/
Re-hide the User /~Library folder
Launch the ‘Terminal’ from Spotlight or the Launchpad then enter the following command to unhide the directory:
chflags hidden ~/Library