Write a PL/SQL block to show the result to neglect double quotation marks in reserved word identifier

DECLARE
  "WORLD" varchar2(20) := 'world';  -- WORLD is not a reserved word
  "DECLARE" varchar2(20) := 'declare';  -- DECLARE is a reserved word
BEGIN
  DBMS_Output.Put_Line(World);      -- Double quotation marks are optional
  DBMS_Output.Put_Line(DECLARE);      -- Double quotation marks are required
end;
/

Sample Output:

ORA-06550: line 6, column 24:
PLS-00103: Encountered the symbol "DECLARE" when expecting one of the following:

   ( ) - + case mod new not null 
    
   table continue avg count current exists max min prior sql
   stddev sum variance execute multiset the both leading
   trailing forall merge year month day hour minute second
   timezone_hour timezone_minute timezone_region timezone_abbr
   time timestamp interval date
   

4. BEGIN
5.   DBMS_Output.Put_Line(World);      -- Double quotation marks are optional
6.   DBMS_Output.Put_Line(DECLARE);      -- Double quotation marks are required
7. end;
8. /