**Of course that’s all true. And I even doubt, if God really granted some Saints (like Jacob with the heavenly ladder) a glance inside heaven. Jesus Christ said “NO eye ever saw…”
But atheists and mockers about heaven, as well as Children who are asking about heaven, won’t be satisfied with: “it’s ineffable”.
I quite often was asked not only by my sons, but mainly by sneerers in a (God) insulting way. Less so by Christians, who where just unsure, and said, well, it’s “a hope”.
No!! It’s definitely not just a mere or vague hope, it’s very real reality. I often answer; “heaven is more real, that all reality on earth” and then I’d add something like “just think of the very best on earth in any way, and multiply this by 77 times as great and wonderful (77 is often mentioned in the Bibel e.g. in Mat 18:22).
We might well think about how “it” will be in heaven.
Saint Ignatius of Loyola often in ecstasies had lively considerations about the Holy Trinity. Let’s have lively considerations about heaven and tell these others if Children (who usually have best thoughts about heaven) or non-believers. Let them feel that we out of Jesus mouth KNOW how real heaven is.
We’ll all be there in a measured length of time. Everywhere we go to and haven’t been before, we make suggestions how it’ll be. So why not heaven. It’s the most natural thing to do. And wherever we go, we’ll tell friends: Oh I think it’ll be such and such; - so why not about heaven.

**