What I take from Abraham and Sarah is that these are one being. Sarah is in the Solar Plexus and is the Wom[b]-man in every being. Sarah was promised a child [son or seed]. This seed is that which is in every human being every 29.5 days according to when the moon is in the sun sign at their birth. The manger is in the Solar Plexus so is the House of Bread [Bethlehem]. This is why it is said one is "raising up grain". The seed must descend into Egypt [below solar plexus] and be baptized in the Jordan [Spinal fluid]. Then the seed is said to be Christened or anointed with oil. Then the seed travels up the spinal column to the cross of the IDA/PINGALA where it is crucified [increased in strength].
So what is encouraging about this tale is that Sarah gave birth to a child in her old age. Which means even though we squander that precious oil thru sexual proclivity, overeating, and other carnal means in our youth, we can turn at any time and begin to lay the foundation with is Jesus Christ. The Kingdom of God is at hand - right now!
Regarding the precious seed germinated in Sarah every 29.5 days -
1Jn 3:9 Whosoever is born of God doth not commit sin; for his seed remaineth in him: and he cannot sin, because he is born of God.
One who preserves that precious seed lays a foundation upon a Rock. But once the foundation is laid, then the permanent house can be constructed.
'Making the creative energy return inward and upward, germinates, is born within us, a wonderful child , a Christified Astral Body. This vehicle bestows immortality upon us. This is our Chrestos mediator. With this vehicle we can reach the Father who is in secret. The Lord of All Perfection said: "No one reaches the Father but through Me".'