Martian Cultures: Martians from Urania (1890) by Camille Flammarion. They are reincarnated Earthlings living in “higher” forms.
"Here we do not eat, have never eaten, and never shall eat. Creation is developing itself gradually, peacefully, and nobly, as it began. Organisms are nourished; or, to express it differently, renew their molecules by a simple respiration, like your terrestrial trees, each leaf of which is a little stomach. In your precious country you can live a single day only on condition of killing. With you, the law of life is the law of death. Here, the idea of killing even a bird has never occurred to any one"
"Remember that the most exquisite beauties, to whom you alluded just now, are but coarse monsters compared to the aerial women of Mars, who live on our spring air, the perfume of our flowers, and are so captivating in the very quivering of their wings, in the ideal kiss of a mouth which has never eaten"
"in which the feminine sex reigns supreme, from an acknowledged superiority over the masculine sex. These organisms are light and delicate, their density of body very slight, their weight slighter still. On the surface of this world material force plays but a secondary part in nature; delicacy of sensation decides everything."
"I also learned that on that planet, so much less material than our own, organisms have no resemblance whatever to terrestrial bodies. Conceptions and births are effected in another way, which reminds one, but under a more spiritual form, of the fecundation and blooming of flowers. "
"The Martials might be called winged, sentient, living flowers; but in fact no earthly being can serve as comparison to aid us in imagining their form and manner of existence."
"Everything with us is exquisitely light, although our planet is much smaller than yours; yet the beings are larger than here, because the weight is less, and beings can grow taller without being impeded by their weight or imperilling their stability."
"The winged species would have ruled over the world, instead of dwindling away in impossibility of development. On Mars, organic development is effected in the series of winged species. Martial humanity is indeed a race of sextupedal origin; but it is actually bipedal, bimanous, and what might be called bialic, since these beings have two wings."
"No; among the inhabitants of your planet the greater part are either ignorant, sceptical, or indifferent, and are unprepared for the spiritual life. They are attached to the Earth, and their attachment lasts for a long time. Many souls sleep completely. Those which act, live, and aspire to know the truth, are the only ones called to conscious immortality, the only ones whom the spirit-world interests, and who are capable of understanding it. These souls can leave the Earth and live in other lands. Many come and live for a while on Mars (the first stage of an ultra-terrestrial journey, going from the Sun), or on Venus, the first abode going the other way; but Venus is a world analogous to the Earth, and still less favored, on account of its too rapid seasons, which oblige its inhabitants to suffer the most sudden changes of temperature. Certain spirits wing their way at once to the starry regions. As you know, space has no existence. To sum up, justice reigns in the moral world as equilibrium does in the physical world; and the destiny of souls is but the perpetual result of their capabilities, their aspirations, and consequently of their works. The Uranian way is open to all; but the soul becomes truly Uranian only when it has entirely shaken off the weight of material life. The day will come, even on your planet, when there will be no other belief, no other religion, than the knowledge of the universe and the certainty of immortality in its infinite regions, in its eternal domain."