How to implement word wrap

Database column contains large string without line feeds.
How to split it with word wrap between words ?
I tried to implement word wrap using

create temp table test (line char(7));
insert into test select repeat('aa ',10);
select * from test;

Expected result is that table test contains multiple rows and every row
contains two words:

aa aa

Instead I got string too long exception.

How to implement word wrap in PostgreSql if string contains words of any
size separated by spaces?

Andrus.