Full Idea
The case of every purposive action is like the supposed purposiveness of the sun's heat - the huge mass of it is wasted, and a part barely worth considering has 'purpose', has 'meaning'.
Gist of Idea
'Purpose' is like the sun, where most heat is wasted, and a tiny part has 'purpose'
Source
Friedrich Nietzsche (Writings from Late Notebooks [1887], 07[1])
Book Reference
Nietzsche,Friedrich: 'Writings from the Late Notebooks', ed/tr. Bittner,Rüdiger [CUP 2003], p.128
A Reaction
A very nice metaphor for human life, where you might discern a purpose in certain large events, but you certainly won't find it in the myriad of small actions that make up nearly all of our existence.