Full Idea
Each one of us should devise his own virtue, his own categorical imperative.
Clarification
A 'categorical imperative' is a universal rule (which Kant said is the key to morality)
Gist of Idea
Each person should devise his own virtues and categorical imperative
Source
Friedrich Nietzsche (The Anti-Christ [1889], 11)
Book Reference
Nietzsche,Friedrich: 'Twilight of the Idols and The Anti-Christ', ed/tr. Hollingdale,R.J. [Penguin 1972], p.122