Full Idea
What's necessary is that something must be held to be true; not that something is true.
Gist of Idea
There are no necessary truths, but something must be held to be true
Source
Friedrich Nietzsche (Writings from Late Notebooks [1887], 09[38])
Book Reference
Nietzsche,Friedrich: 'Writings from the Late Notebooks', ed/tr. Bittner,Rüdiger [CUP 2003], p.148
A Reaction
This may be right, but it doesn't follow that the truths we label as 'necessary' are the ones that we have to believe, or even that we have to believe that our chosen beliefs are necessary rather than contingent. Why did we pick those beliefs?