psql> INSERT INTO psql (sql_statement) VALUES (
'
INSERT INTO items(parent_id, user_id, text)
VALUES (
  385673,
  6030,
  ''I mean, you did learn _some_ SQL right now just by reading this, no? :)''
)');
psql> SELECT * FROM psql;
                                sql_statement
-----------------------------------------------------------------------------
                                                                            +
 INSERT INTO items(parent_id, user_id, text)                                +
 VALUES (                                                                   +
   385673,                                                                  +
   6030,                                                                    +
   'I mean, you did learn _some_ SQL right now just by reading this, no? :)'+
 )
(1 row)

• Arch Linux Wiki, Section 4.1: Access the database shell, PostgreSQL
• PostgreSQL 13 Documentation, Chapter 2: The SQL Language