“The stars are real.
The future is that mountain.”

Source: Thus Spoke Zarathustra

Reprinted in The Wild Muir ISBN 0-939666-75-8 page 38, and Terry Gifford, EWDB, page 234
Source: 1860s, My First Summer in the Sierra, 1869

Source: Alone (1938), Ch. 6

8 September 1833. As quoted in: Maurice York and Rick Spaulding (2008): Ralph Waldo Emerson – The the Infinitude of the Private Man: A Biography. https://books.google.de/books?id=_pRMlDQavQwC&pg=PA240&dq=A+man+contains+all+that+is+needful+to+his+government+within+himself&hl=de&sa=X&ved=0ahUKEwiahO73qqfeAhUwpIsKHRqzDswQ6AEIQDAD#v=onepage&q=A%20man%20contains%20all%20that%20is%20needful%20to%20his%20government%20within%20himself&f=false Chicago and Raleigh: Wrighwood Press, pages 240 – 241. Derived from: Edward Waldo Emerson and Waldo Emerson Forbes (1909): Journals of Ralph Waldo Emerson, with annotations, III, pages 200-201.
1820s, Journals (1822–1863)
Context: A man contains all that is needful to his government within himself. He is made a law unto himself. All real good or evil that can befal [sic] him must be from himself. He only can do himself any good or any harm. Nothing can be given to him or can taken from him but always there is a compensation.. There is a correspondence between the human soul and everything that exists in the world; more properly, everything that is known to man. Instead of studying things without the principles of them, all may be penetrated unto with him. Every act puts the agent in a new position. The purpose of life seems to be to acquaint a man with himself. He is not to live the future as described to him but to live the real future to the real present. The highest revelation is that God is in every man.

Variant: To live only for some future goal is shallow. It's the sides of the mountain that sustain life, not the top.
Source: Zen and the Art of Motorcycle Maintenance (1974), Ch. 17
Context: Mountains should be climbed with as little effort as possible and without desire. The reality of your own nature should determine the speed. If you become restless, speed up. If you become winded, slow down. You climb the mountain in an equilibrium between restlessness and exhaustion. Then, when you are no longer thinking ahead, each footstep isn't just a means to an an end but a unique event in itself. This leaf has jagged edges. This rock looks loose. From this place the snow is less visible, even though closer. These are things you should notice anyway. To live only for some future goal is shallow. It’s the sides of the mountain that sustain life, not the top. Here's where things grow. <!-- p. 205

Scholastic interview (1998)

Lonesome Traveler (1960)

Prelude (1910).