Full Idea
Naivety: as if morality remained when the sanctioning God is gone. The 'hereafter' is absolutely necessary if belief in morality is to be upheld.
Gist of Idea
Morality can only be upheld by belief in God and a 'hereafter'
Source
Friedrich Nietzsche (Writings from Late Notebooks [1887], 02[165])
Book Reference
Nietzsche,Friedrich: 'Writings from the Late Notebooks', ed/tr. Bittner,Rüdiger [CUP 2003], p.93
A Reaction
This is the 'good' and 'evil' of social values, not the natural values which accompany the life of any creature (see Idea 7136). Even with a God, it required the priests to interpret the morality and the sanctions, and they had their thumbs in the scales.
Related Idea
Idea 7136 Morality is a system of values which accompanies a being's life [Nietzsche]