"Hiring" the material bodily vessel from Maha-Visnu's dreams.

The visiting jiva-souls who enter the material creation and obtain (hire) a material bodily "blue-print" from Maha-Visnu's dreams, those "dreams" are already an established reality from its beginning to its end.

Every material bodily vessel in the material creation must be first "hired" from Maha-Visnu who owns them all.

Srila Prabhupada - "We are not the owner of this body, not the owner of the senses. The senses are "hired" from the Supreme Lord. This is very subtle understanding, one should know the proprietor of the senses is God." (March 1966 NY City USA)

Srila Prabhupada - "The "immediate" expansions of the Lord are called svāṁśa or "personal direct" expansions (Visnu-tattva). The "separated" expansions of the Lord are called vibhinnāṁśa - jiva-tattva or independent jiva-souls like us." (BG 10.37, Purport)

Each individual jiva-soul in the spiritual world can "choose" to "voluntarily" serve Krsna in an unlimited variety of ways as an unlimited varieties of bodily forms, or even reject Krsna if they choose to do so, and enter or return to the impermanent material world.

Each material bodily vessel pathway is always available for "hire" to the jiva-souls, and are continuously available to all visiting jiva-souls who also "choose" to enter the temporary decaying material creation.