Call dbms_output.put_line to display text message
SQL> SQL> set serveroutput on SQL> begin 2 dbms_output.put_line( 'One' ); 3 dbms_output.put_line( 'Two' ); 4 dbms_output.put_line( 'Three' ); 5 end; 6 / One Two Three PL/SQL procedure successfully completed. SQL> --