I found it! The quote by John Muir. I read it somewhere and lost it again but the essence remained in my heart:
I only went out for a walk and finally concluded to stay out till sundown, for going out, I found, was really going in.
The Unnamed Lake by Frederick George Scott creates a huge longing for big nature but as you can see I found my own unnamed lake:
…Dark clouds that intercept the sun
Go there in Spring to weep,
And there, when Autumn days are done,
White mists lie down to sleep.
Sunrise and sunset crown with gold
The peaks of ageless stone,
Where winds have thundered from of old
And storms have set their throne.
No echoes of the world afar
Disturb it night or day,
The sun and shadow, moon and star
Pass and repass for aye…