What does peace in heaven mean? In the book of Revelation we read,

"And I heard a voice from heaven, saying,
"Write, 'Blessed are the dead who die in the Lord from now on!'"
"Yes," says the Spirit, "so that they may rest from their labors,
for their deeds follow with them." (Rv 14:13)

Fra Agelico detail the "Blessed in Heaven"

Peace in Heaven will come about due to the Vision of God or the sight which contains in itself the power of banishing all pain, all the sorrows from the beholder, and of infusing joy and happiness in the soul. But the peace of Heaven is much more than the negative aspect above. The soul is elevated above its nature to participate in the attributes of God --his goodness, truth, knowledge, justice, wisdom, love, strength, holiness, immortality and many more--to a far greater extent possible on earth. "All the faculties of will, of understanding, of reason, and even sense, act in perfect harmony with each other. There could be no hesitation whether to speak or act; there could be no doubt about how we ought to act, or what we should say. There would be no imperfection in our utterance. We could express ourselves fully to the nicest shade of meaning; there would be no danger of being misunderstood. The hand and foot, and the whole spiritual body, would perfectly obey the will. Every faculty and organ would move as one and reach the desired attainment." (Chancey Giles, The Nature of Spirit and of Man as a Spiritual Being, Philadelphia: New Church tract, 1934) This perfect order and harmony of human nature is at the same time the profound peace of this transfigured human nature.

The restful heavenly life does not mean inactivity because we are active by nature. In the heavenly dimension we will be much more active than on earth because our powers will have reached the highest perfection and we will not become tired or fatigued. There will be no division between the contemplative and active life because our external activity will not interfere with our contemplation of God. Our social interaction will no longer suffer the limitations of time and space as we know it, we will travel at the speed of thought and even our bodies motion will not be hampered by matter.

Our happiness in heaven while it depends on God does includes the added happiness of our resurrected body and the renewed universe which will engage our sense life as never before. Chancey Giles has well noted, "How little we know of the meaning of the outward world! The flower is lovely, the landscape beautiful, the mountain sublime, but we gather only a vague and imperfect meaning from them. They say but little to us. But in heaven it is not so. Everything in particular and in general will answer to our affections and thoughts; will be our idea; and we shall feel a personal interest in it. There will be the same harmony and unity of the whole outward world with the whole world within, that there is between the various faculties of our being. Imagine yourself to be in such a world, in such a state, where perfect harmony reigns!" We shall see the glory of God shining forth from all creatures in a way only possible now as an occasion flash of intuition. Iconographers suggest this glory by the use of gold outlining in their icons.

With the resurrection of the body complete harmony and peace is established between mankind and the external world. Now through the body man can experience a union and a control over nature far superior to his control through technology. How do we know this? Did not Christ's body pass through solid matter after the resurrection? "Our heavenly power over nature will be as great as our present power over our own bodies, because nature will will than be our greater body." "Peter Kreeft, Everything You Ever Whatever to Know About Heaven, Ignatius Press, San Francisco, 1990, p. 109) God will let nature obey our authority because in the heavenly dimension we will be obedient to His will as sons of the Father.

'The saint find their home in the kingdom of heaven;
their life is an eternal peace."

(Christian Prayer: The Liturgical Hours, p. 1420)