86. That good and truth are in created subjects according to the form of each, is because every subject receives influx according to its form. The preservation of the whole is nothing else than the perpetual influx of Divine Good and Divine Truth into forms created by that influx. Thus subsistence or preservation is perpetual existence or creation. That every subject receives influx according to its form may be illustrated in various ways, as for instance, by the influx of heat and light from the sun into plants of every kind. Each one of these receives this influx according to its form; thus every tree according to its form, every shrub according to its, every herb and every blade of grass according to its. The influx is the same into them all; but the reception, being according to the form, causes each species to remain the same. It may also be illustrated by the influx into animals of every kind, according to the form of each. That influx is according to the form of each thing, can be seen even by a rustic if he gives heed to the fact that various wind instruments, such as pipes, flutes, cornets, trumpets, and organs, give forth sound from the same blowing or inflow of air, according to their forms.