The Kingdom of God has the interesting property of having to be shared and extended in order to exist. And the Course teaches that in order to truly 'have' something, you must give it away, because giving it proves that you must have had it and you can only give what you have. It also tells us that in order to experience anything you must SHARE in it because it is available to all and is not for your private possession.
"To have all, give all to all".
This is also reflected in "giving and receiving are one".
What it means is, things of God don't just sit there idle doing nothing. God isn't just "being God" without any increase or creation. If you are not sharing and extending love, love is not being love. This is why definitions of 'oneness' and 'non-duality' fall far short of the creative, extending, loving qualities of God.
We are also told that miracles which come from love will "go out because of what they are", but that "you are needed that they can begin." What that means is, love simply automatically radiates and extends by its own nature, but in order to allow it to extend through you you have to remove your blocks to it first. Then it moves through you without you having to make it do so.
Everything about God's Kingdom shares this nature. Something is not real unless it is shared, open, extending, increasing. This sharing and extending is like a RADIANCE or a radiation, or radiating outward. This produces LIGHT and PRESENCE. In a sense "God said, let there be light", speaks to God's creative ability to shine and create and extend.
Remember that in God's Kingdom everything is increased by being given, and giving something does not mean there is a loss (an ego idea). Instead, giving anything real increases it because giving does the opposite of losing.
Jesus talks about this in terms of everything being an idea. When you share an idea it is increased and it becomes stronger the more people believe in it. It does not diminish and the person having the idea does not lose anything.
The Course also says, "nothing real can be increased except by sharing". It is also the nature of love to extend and increase, because it has absolutely no reservations or limits or reasons to withhold itself from "shining" and radiating and going out everywhere.
Jesus talks about this in how the children of God contain the same "inner radiance" as the Father, and this is the source of all extension and creation.
Creation and extension and sharing are the same thing. To share to the ego means both parties have less than the whole. To share in Heaven means that both parties SHARE the WHOLE, and there is no decrease, and in fact there is an increase. The total is greater than the sum of the parts.
This is also true of the Sonship - "the combined total of the Sonship is greater than the sum of its parts". This is because each Son in the Sonship is not just a finite unit. Instead, each son SHARES and extends and increases and amplifies the rest of the Sonship. So it's not just like 500 sons lined up alongside each other, it's more like 500 sons overlapping and increasing with each other, creating a wholeness which is far larger than their individual contributions. This is also part of the holographic nature of creation.
Everything about God, His Kingdom, Creation, Extension, Sharing, Reality, Truth, Love, it all has this property of increase and sharing and going out and radiating and illuminating. And if this radiating and extending were not occurring, none of this stuff would be able to exist.
Love could not be love unless love loved to love and radiated love and extended and increased love's presence. Creation would not be possible at all (since nothing real can increase unless it shares) if it weren't for this sharing, giving, increasing.
There would be no light without the ability for it to shine, which means to "project" or extend outward beyond its source. God would have no Sons or Sonship and Heaven could not exist without it being in a constant state of radiance and increase.
Also therefore you cannot have or enjoy or share in anything real unless you also are willing for it to be given and extended. This is because, if you think about it, in order to receive something of God, you cannot just take it and possess it and diminish God's supply of it. Instead you have to be open to receive, to SHARE it, ie both you and God are experiencing the same thing, which also means this openness makes you willing to GIVE it as much as you receive it - giving and receiving are one, and therefore to experience love requires the willingness to share, receive, and give love, which automatically increases it.
God's act of CREATION, which we also possess since God shared it with us and created us capable of creating like Him, is an act of RETAINING your own light and love and yet 'projecting' it outward so that you shine, and this shining produces an increase, and manifests a "new creation" which itself possesses the ability to create and extend to exactly the same degree as yourself and God, and so now there is the whole of God + the whole of you + the whole of your own creations, and nothing is lost, and so there has only been an INCREASE. This is why Heaven rejoices as each Son of God returns Home to increase its light, and why joy increases, and everything just keeps on "growing" infinitely.
As love is received, shared, and extended, it increases because you are now acting like an amplifier or a relay which boosts the signal as it passes through. By giving it, by sharing it, you can 'have it', but you can't 'have' it by claiming it in isolation for yourself (which is ego). And so anything that is real cannot be possessed it has to be shared, and so anything real automatically has this sharing/increasing quality to its "terms and conditions". To exist (to have), it MUST extend. This is also why God creates and why every child of God is imbued with the same will to create. It is NATURAL to extend and create and to increase the presence of love. Nothing can exist without sharing and extension and equal giving and receiving.