The word dimension here refers to an aspect of God's creation in which we will live in the light of God's vision. Christ came into the world to prepare mankind for God's Kingdom and has given us hints as what it will be like. He pointed out that the God of Abraham, Isaac and Jacob is the God of the living and not of the dead. To those who envisioned heaven's life like that on earth he told them that at the resurrection we will live a life similar to that of the angels and that in his Father's house there were many dwelling places. He told the apostles that he was leaving this world to prepare a place for them. And at Mt. Tabor Christ declared, "Blessed are the clean of heart: for they shall see God." (Mt 5:8)
What will our beginning experience of heaven be like? Immediately after death of the body, our soul will suddenly awake to the light of glory. Like a flower which opens to the brilliant light and warmth of the sun, our souls intellectual powers will be raised to the incredible vision of God with the experience of his eternal love and joy. It is a vision which transcend our way of seeing as St. Paul so beautifully expressed it,
This experience will be proportionate to each one level of grace at death and in this sense there are many dwelling placed in God's Kingdom as there are human beings in the heavenly dimension.
Where is Heaven? In the past, mankind looked up the starry sky and thought that was heaven. Today we know better. It is an invisible dimension of God's creation, a dimension of the astounding visible universe encompassing of 100 billion galaxies and counting. "Oh, the depth of the riches and wisdom and knowledge of God! How inscrutable are his judgments and how unsearchable his ways ! (Rm 11:33) God is the creator of place which is in relation to himself and He is present in each place in a different ways. Even our dimension of time and space, God is more present to a human being than He is to a rock, a plant or an animal. So in heaven God is more present in some places than in others without being limited by space. The Middle Ages defined God as "a spiritual sphere whose center is everywhere and whose circumference is nowhere." God, as the reality in the universe, is reflected in it. In relative space there is no absolute center to the universe and since it is constantly expanding or changing there is no boundary to it. This being the case, heaven can be anywhere and everywhere in the invisible dimension of the universe where human souls are gathered living the life of the Beatific Vision. Since human being in this dimension have no bodies, they are where they are acting and as we saw in the previous page, it is the human spiritual presence which define place, or in this case, their heavenly place.
How will we experience the universe? Now we see the creatures by the light of the sun. With death we can no longer see the universe with our eyes, hear the song of the bird with our ears, taste food with our mouths, smell the roses with our nose and touch the earth with our hands, so how will we be in touch with God's creation? Again, our minds will be transformed to see the manifold truths of creatures bathed in God's wisdom and love which we now see dimly on earth by the light of the sun, reason and faith. Our vision of the world now comes in fragmentary ways through our senses subject to error. The vision of creatures in heaven consist of an insight into their essences with infallible accuracy as to their nature, origin and end.
Is there space and time in heaven?
In a sense there has to be because we are creatures whose presence to each other implies separation or individuality and communication implies duration of some sort. Only God is absolutely spaceless and timeless. From this standpoint Boethius defines God as "the simultaneous possession of all perfection in a single present." Everything is present to God now, therefore, the closer we are to God in the heavenly dimension, the more we participate is God's timelessness and spacelessness There is a communion of persons in heaven. We on earth meet one another face to face or by means of communication media such as e-mail or cellphone. Most likely in the heavenly dimension the will-thought of a person will make us present to that person and able to communicate our thoughts directly to the other's conscious mind. Even now we can let our thoughts known to the saints in heaven through prayer and at times they answer us through the miraculous powers God has granted them. We will rejoice in heaven in everything that is because our likeness to God will free us from all self concerns which distract us from being fully present and aware of what is. And so we pray:
the deer longs for streams of water,
so my soul longs for you, O God.
My being thirsts for God, the living God.
When can I go and see the face of God?"