Heaven is so far of the Mind — Ecstasy and Rationality

Heaven is so far of the Mind 1
That were the Mind dissolved-
The Site-of it-by Architect
Could not again be proved-

'Tis vast-as our Capacity-5
As fair-as our idea-
To Him of adequate desire
No further 'tis, than Here-
(F.413/J.370)
[1] Heaven:: supreme happiness, ecstasy. far, Mind:: one's rational faculty, is far from ecstasy.
[2] Mind dissolved:: lost the sense of reasoning.
[3] Site, Architect:: the origin of happiness by its creator.
[5] vast, Capacity:: the happiness is as large as we can bear.
[6] fair, idea:: the happiness is as fair as we can imagine.
[7] Him, adequate:: the one who desires rationally.
[8] Here:: the ecstasy is here if we desire adequately.