Any planet is 'Earth' to those that live on it.

Will the concept of the Sacred exist in some planet of another galaxy where, by now it is certain, thousands of worlds preserve some form of life?

The only truly alien planet is Earth.

Is there evil but on earth? or pain in every peopled sphere?

Our own globe earth, in fact is technically a "hell" because it is a relatively dense material sphere and the states of consciousness of the beings inhabiting it are relatively heavily involved in the webs of maya — illusion. For this reason H. P. Blavatsky in The Voice of the Silence speaks of "Men of Myalba" — Myalba being a Tibetan term used for one of the hells in the philosophy of Northern Buddhism, and Myalba is our earth. (Chapter 11)

The earth is a living, conscious being. In company with cultures of many different times and places, we name these things as sacred: air, fire, water, and earth. Whether we see them as the breath, energy, blood, and body of the Mother, or as the blessed gifts of a Creator, or as symbols of the interconnected systems that sustain life, we know that nothing can live without them. To call these things sacred is to say that they have a value beyond their usefulness for human ends, that they themselves become the standards by which our acts, our economics, our laws, and our purposes must be judged. No one has the right to appropriate them or profit from them at the expense of others. Any government that fails to protect them forfeits its legitimacy. All people, all living things, are part of the earth life, and so are sacred. No one of us stands higher or lower than any other. Only justice can assure balance: only ecological balance can sustain freedom. Only in freedom can that fifth sacred thing we call spirit flourish in its full diversity. To honor the sacred is to create conditions in which nourishment, sustenance, habitat, knowledge, freedom, and beauty can thrive. To honor the sacred is to make love possible. To this we dedicate our curiosity, our will, our courage, our silences, and our voices. To this we dedicate our lives.

The planet, our mother, Grandmother Earth, is physical and therefore a spiritual, mental, and emotional being. Planets are alive, as are all their by-products or expressions, such as animals, vegetables, minerals, climatic and meteorological phenomena. Believing that our mother, the beloved earth, is inert matter is destructive to yourself. (There's little you can do to her, believe it or not.) Such beliefs point to a dangerously diseased physicality. Being good, holy, and/or politically responsible means being able to accept whatever life brings and that includes just about everything you usually think of as unacceptable, like disease, death, and violence. Walking in balance, in harmony, and in a sacred manner requires staying in your body, accepting its discomforts, decayings, witherings, and blossomings and respecting them. Your body is also a planet, replete with creatures that live in and on it.

The Earth is beautiful, and bright, and kindly, but that is not all. The Earth is also terrible, and dark, and cruel. The rabbit shrieks dying in the green meadows. The mountains clench their great hands full of hidden fire. There are sharks in the sea, and there is cruelty in men’s eyes.

Earth is in heaven. It spins, falls, and floats in a spiral nebula. Earth is not opposed to heaven: it belongs in it as a member of the whole company of the stars.

Mars is a planet which has three levels or zones - zones A, B and C. Zone A is very advanced, has beings who are very advanced indeed. Zone B has beings who are really quite advanced. Zone C has beings whom you would not want to meet on a dark night! Notwithstanding, the kind of evil there is not of the same kind as we get on this planet, because the planet Mars as a whole is within the mainstream of the Will of God, so to speak. Mars is also in the middle round, its fourth round, is not a sacred planet, and so it has evil.

The earth is not a lair, neither is it a prison. The earth is a Paradise, the only one we'll ever know. We will realize it the moment we open our eyes. We don't have to make it a Paradise-it is one. We have only to make ourselves fit to inhabit it. The man with the gun, the man with murder in his heart, cannot possibly recognize Paradise even when he is shown it.

The Earth is not just an ordinary planet! One can count, there 111 kings...

We have had a profound paradigm shift about the Whole Earth. We know it now as a jewel in space, a fragile water planet. And we have seen that it has no natural borders. It is not the globe of our school days with its many-colored nations. p.407

I think there is some kind of divine order in the universe. Every leaf on every tree in the world is unique. As far as we can see, there are other galaxies, all slowly spinning, numerous as the leaves in the forest. In an infinite number of planets, there has to be an infinite number with life forms on them. Maybe this planet is one of the discarded mistakes. Maybe it's one of the victories. We'll never know.