Three and Seven

It began, I think, with lucky Three
so when the Venn of Trinity
confirmed a summary purity

it simply had to be, But then
there is recurring Seven
another odd, forgoing even
a number level for a heaven
a prime example of perfection
undivided in completion
which could also be the One

just like the Venn of Trinity
which brings me back again to Three
or even Ten, in sum of numerology