There are three spiritual modes of internal energy called
sandhini-sakti, samvit-sakti, and hladhini-sakti. Over the next few
weeks each of these component parts will be discussed, beginning with
this paper on sandhini-sakti.

Eternality, or sat, is conducted by the sandhini potency, and is the
impersonal Brahman (brahmajyoti) feature of Godhead. Being limitless,
it extends in all directions—three fourths in Vaikuntha, and one
fourth as the resting place of this cosmic manifestation, or
mrtyu-loka (the place of death). Juxtaposed to the sat feature,
Mrtyu-loka is known as asat, or nonexistent, being impermanent.

The manifested cosmic creation, called triloka is arranged in three
spheres known as Svarga-loka, Martya-loka and Patala-loka; the upper,
middle and lower planetary systems respectively. When the eternal
living being wishes to satisfy his senses, he is supplied with a body
comprised of five material elements within the prison house of
triloka, and is forced into a life of bondage. Shackled by sex-life,
he toils endlessly in the cycle of samsara, life after life.

No one within this realm can experience the sat feature of the Lord
while remaining in material consciousness. When the living entity
desires to turn from a life of temporal existence to a life of
permanence in Vaikuntha-dhama, he must undergo a transformation. When
qualified, he receives a suitable non-material body by the sandhini
potency in which to engage in devotional service.

In the eternal realm of Vaikuntha, not even a trace of the asat nature
can be found. Unlike sattva-guna, the adulterated mode of material
goodness, Vaikuntha-dhama exists eternally in a state of
visuddha-sattva or vasudeva-sattva, the transcendental mode of pure
goodness. The Lord along with His pure devotees, household
paraphernalia, etc. are situated eternally in that existence.

Srila Prabhupada: "…this sandhini-sakti of the internal potency
maintains and manifests all the varigatedness of the spiritual world.
In the kingdom of God, the Lord's servants and maidservants, His
consorts, His father and mother and everything else are all
transformations of the spiritual existence of sandhini-sakti. The
existential sandhiné-sakti in the external potency similarly expands
all the varigatedness of the material cosmos, from which we can have a
glimpse of the spiritual field."

Hare Krsna,

Bhava dasa (ACBSP)