Great idea, Space Engineer! I went through some lists of quotes, and pulled out the ones I thought best for space engine:
Per Aspera, Ad Astra.
— "Through hardships, To the stars." Motto of NASA and the South African Air Force. From Seneca the Younger.
Space is to place as eternity is to time.
— Joseph Joubert
The flight experience itself is incredible. It’s addictive. It’s transcendent. It is a view of the grand plan of all things that is simply unforgettable.
— Scott Carpenter, astronaut. Interview with the Rocky Mountain News.
Astronomy taught us our insignificance in Nature.
— Ralph Waldo Emerson
In 'Historic Notes of Life and Letters in New England', Emerson's Complete Works: Lectures and Biographical Sketches (1883), 317.
It is a most beautiful and delightful sight to behold the body of the moon.
— Galileo Galilei
In pamphlet, The Sidereal Messenger (1610), reprinted in The Sidereal Messenger of Galileo Galilei: And a Part of the Preface to the Preface to Kepler's Dioptrics Containing the Original Account of Galileo's Astronomical Discoveries (1880), 8.
The contemplation of celestial things will make a man both speak and think more sublimely and magnificently when he descends to human affairs.
— Marcus Tullius Cicero
In Louis Klopsch, Many Thoughts of Many Minds (1896), 18.
Whatever else astronomy may or may not be who can doubt it to be the most beautiful of the sciences?
— Isaac Asimov
Epigraph in Isaac Asimov’s Book of Science and Nature Quotations (1988), 26.
Certainly one of the most enthralling things about human life is the recognition that we live in what, for practical purposes, is a universe without bounds.
— James Alfred Van Allen
No storyteller has been able to dream up anything as fantastically unlikely as what really does happen in this mad Universe.
— Robert Heinlein
Time Enough For Love: the Lives of Lazarus Long (1973, 1987)
We should do astronomy because it is beautiful and because it is fun. We should do it because people want to know. We want to know our place in the universe and how things happen.
— John N. Bahcall
From interview in 'A New Decade Dawns for Astronomy', Sky and Telescope (Jan 1990), 79, No. 1, 19. The quote is cited in Current Biography Yearbook (2000), 30.
Put three grains of sand inside a vast cathedral, and the cathedral will be more closely packed with sand than space is with stars.
— Sir James Jeans
In 'Our Home in Space.' In R.C. Prasad (ed.), Modern Essays: Studying Language Through Literature (1987), 26.
"It is a pity, in an age of rockets and space telescopes, that so few people have a direct acquaintance with the stars."
— Richard Berry, Discover the Stars (p. 2)