Formless is the
Fruit of the 4 Infinite States:

The Blessed Buddha once pointed out some
fine future fruits:
I:
The release of mind by
universal friendliness developed,
when linked with
the
7 links to Enlightenment, has the
beautiful liberation as culmination!
II:
The release of mind by
compassionate pity developed,
when all joined with
the
7 links to Enlightenment,
has the infinitude of space,
as culmination!
This is the 1st formless absorption.
III:
The release of mind by
altruistic & mutual joy
developed, when all linked
with the
7 links to Enlightenment, has
the infinitude of consciousness,
as ultimate culmination...
This is the 2nd formless absorption.
IV:
The release of mind by
imperturbable equanimity developed,
when combined
with the
7 links to Enlightenment,
has the sphere of nothingness,
as the
absolute culmination... This is the 3rd formless absorption.
So do these 4 divine & infinite states of
friendliness,
pity,
mutual joy
and
equanimity,
when cultivated fused together with the
7 links to Enlightenment:
Awareness,
Investigation,
Energy,
Joy,
Tranquillity,
Concentration
and
Equanimity,
lead to entry and absorption
into these 4 sublime formless
mental dimensions of subtle supra-mundane consciousness...