This is the last stanza of the poem ‘Desert Places’ by Robert Frost-

“They cannot scare me with their empty spaces
Between stars – on stars where no human race is.
I have it in me so much nearer home
To scare myself with my own desert places.”

I find in it a sentiment much akin but antipodean to Edward Dyer’s

“My mind to me a kingdom is;
Such present joys therein I find,
That it excels all other bliss
That earth affords or grows by kind:
Though much I want that most would have,
Yet still my mind forbids to crave.”

But negative or positive, I think Led Zeppelin sum it up in ‘Misty Mountain Hop’ with

“I know that it’s all a state of mind” 🙂