Full Idea
My conception of duty does not need to be based on any particular end, but rather itself occasions a new end for the human will, that of striving with all one's power towards the highest good possible on earth, the universal happiness of the whole world.
Gist of Idea
Duty does not aim at an end, but gives rise to universal happiness as aim of the will
Source
Immanuel Kant (True in Theory, but not in Practice [1792], 1B)
Book Reference
Kant,Immanuel: 'Political Writings', ed/tr. Reiss,Hans [CUP 1996], p.65
A Reaction
I see nothing in the categorical imperative that demands 'all one's power', and nothing that specifies happiness as what has to be universalised. Nietzsche, for one, thinks happiness is overrated.