If you love someone, and he/she ("they") loves you in return, then:
it is commonly said, they love each other.
This is intended to signify that each one loves the other one, BUT
you can take it literally to mean,
each one loves each other, which means EVERYBODY
Maybe all in all is all we really are.
And love of one is truly love of all.
If you take this to be a virtue, then maybe you should marry the person you detest the most.
Or, you can just love spiders or something.
18 hours ago