**How can I permanently rebind keys?**

I'd like to rebind `C-i`, `C-j`, `C-k`, and `C-l` to act like the arrow keys.  However, when using

    (global-set-key (kbd "C-l") 'forward-char)

it will only do so for the session; the bindings don't persist after restarting Emacs.

Is there some way to automatically do this every time on startup or via a config file or something?