Full Idea
So far as practical reason has the right to lead us, we will not hold actions to be obligatory because they are God's commands, but will rather regard them as divine commands because we are internally obligated to them.
Gist of Idea
We don't accept duties as coming from God, but assume they are divine because they are duties
Source
Immanuel Kant (Critique of Pure Reason [1781], B847/A819)
Book Reference
Kant,Immanuel: 'Critique of Pure Reason', ed/tr. Guyer,P /Wood,A W [CUO 1998], p.684
A Reaction
Thus Kant agrees with Plato in his response to the latter's 'Euthyphro Question' (Ideas 336 and Idea 337).
Related Ideas
Idea 336 Is what is pious loved by the gods because it is pious, or is it pious because they love it? (the 'Euthyphro Question') [Plato]
Idea 337 It seems that the gods love things because they are pious, rather than making them pious by loving them [Plato]