ISB 16 - three angelic heavens, three degrees of the human mind

ISB 16 [5-6]
. . . there are three angelic heavens:
a highest, which is also called the third heaven,
where are the angels of the highest degree;
a middle, which is also called the second heaven,
where are the angels of the middle degree;
and a lowest, which is also called the first heaven,
where are the angels of the lowest degree.
Those heavens are also distinguished
according to the degrees of wisdom and love.
Those who are in the lowest heaven
are in the love of knowing truths and goods;
those who are in the middle heaven
are in the love of understanding them;
and those who are in the highest heaven
are in the love of being wise,
that is, of living according to those things
which they know and understand.

Since the angelic heavens
are distinguished into three degrees,
therefore the human mind
is also distinguished into three degrees,
because the human mind is an image of heaven,
that is, it is a heaven in the least form.
So it is that a person can become an angel
of one of those three heavens,
and this is effected according to his reception
of wisdom and love from the Lord:
an angel of the lowest heaven
if he receives only the love of knowing truths and goods;
an angel of the middle heaven
if he receives the love of understanding them;
and an angel of the highest heaven
if he receives the love of being wise,
that is, of living according to them.