Full Idea
We invented the concept 'purpose': in reality purpose is lacking.
Gist of Idea
'Purpose' is just a human fiction
Source
Friedrich Nietzsche (Twilight of the Idols [1889], 5.8)
Book Reference
Nietzsche,Friedrich: 'Twilight of the Idols and The Anti-Christ', ed/tr. Hollingdale,R.J. [Penguin 1972], p.54