What's your opinion about this?

I think it is true although I would substitute community for the word estate in today's world. I think the 'unseen' and 'unheard' is that of the mind and can include your thoughts about everything and everyone including God and the afterlife. Even Shakespeare had thoughts about that when he wrote "Who knows what dreams may come when we have shuffled off this mortal coil." Although she spoke her mind and said things that others only dared to think there are always things that you never speak about. They may be dark thoughts or strange ones or even an undeclared love but we all have them including you and me. It is not a bad thing because there should always be an element of mystery about us all. Good luck in your search for answers.