Genesis introduces the image of the creation of a firmament to divide the waters above and the waters below and become a barrier between them.
It is said that the lower waters, wishing to be before the King of the Universe, weep and complain: Why do we have to remain below and not above?
Separation is suffering.
One of the presumed answers of God to this separation is the salt of the sacrifice at the Holy Temple.
Salt on the offerings on the alter represents the lower waters that want to rise up.
There is a description of this in the answer to a Talmudic question: When are the days of joy greatest?
When water is poured on the altar on the last day of Succot to bring the winter rains.
The lower waters are offered up to fulfill themselves in joyful rising.
When not offered up, the lower waters are considered weeping waters.
The universal process is the essential relation between the one who receives influence and the one who influences.
An identical principle is evident in the interaction between direct Light (symbolized by Abraham) and returning or reflected Light (Isaac).
They both serve the purpose of raising the lower, feminine waters.
Another allegoric symbol is the emission of a woman's seed in order for the sperm to fertilize it.
Still another image is the saying: On that day will living waters come forth from Jerusalem.
Isaac digs the wells through which the waters are brought up from the depths.
His whole being is a movement from below upwards.
His nature is to overturn the order of the world, for the world functions by virtue of forces flowing from above downward.
–Rabbi Adin Steinsaltz
From In the Beginning by Rabbi Adin Steinsaltz