One
A company might have executives setting policy and strategy, engineers designing products, managers handling personnel and others handling various functions. They all do different things -- but if they're doing them with a shared underlying purpose, the company -- and the individuals in it -- will likely be successful. The Lord wants all human society to function in a similar way. We have different skills and individual loves, but if we all share a mutual love -- a love of serving others -- then society will function as one, will be a reflection of heaven and will be a good receptacle for the Lord's love. This can also happen within each of us, as we unify our talents and ideas around a central love. And in an abstract sense, it illustrates how a wide collection of varying ideas can be unified around a shared good intention. That is the kind of love pictured when “one” is used in the Bible, either as a specific number or in the sense of several people or objects “being one.” In more casual references -- when used to identify a specific person or object -- the meaning is relatively literal, and is connected to that person or object.
Ezekiel 21:9-15
9
Son of man, prophesy, and say, Thus says Yahweh: say, A sword, a sword, it is sharpened, and also furbished;
10
it is sharpened that it may make a slaughter; it is furbished that it may be as lightning: shall we then make mirth? the rod of my son, it condemns every tree.
11
It is given to be furbished, that it may be handled: the sword, it is sharpened, yes, it is furbished, to give it into the hand of the killer.
12
Cry and wail, son of man; for it is on my people, it is on all the princes of Israel: they are delivered over to the sword with my people; strike therefore on your thigh.
13
For there is a trial; and what if even the rod that condemns shall be no more? says the Lord Yahweh.
14
You therefore, son of man, prophesy, and strike your hands together; and let the sword be doubled the third time, the sword of the deadly wounded: it is the sword of the great one who is deadly wounded, which enters into their rooms.
15
I have set the threatening sword against all their gates, that their heart may melt, and their stumblings be multiplied: ah! it is made as lightning, it is pointed for slaughter.