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Package initializer [Oracle PL/SQL]

A package initializer is executed at most once for a session. It is executed when the package is first accessed within that session. This is demonstrated in the following: 
create or replace package pck_init_ex as

  procedure print(t in varchar2);

end pck_init_ex;
/

create or replace package body pck_init_ex as

  procedure print(t in varchar2) is begin
    dbms_output.put_line(t);
  end print;

  begin -- Here's the package initalizer
    print('Loaded');

end pck_init_ex;
/
Any session: 
exec pck_init_ex.print('one');

Loaded
one

exec pck_init_ex.print('two');

two
Any other session: 
exec pck_init_ex.print('three');

Loaded
three

exec pck_init_ex.print('four');

four