Śyāmasundara: After Kant finished this analysis of the pure reason, then he began his Critique of Practical Reason, of reason applied to practical living, to try to find out what were the limits of that study. This is his idea: moral laws are necessary and universal objects of the human will, which must be accepted as valid for everyone. He calls this his categorical imperative. That means that there are certain moral commandments which are universal, and which must be applied to everyone, and which everyone must obey without exception. Now, he says that we know these moral laws a priori, by intuition, and that the individual fact and the situations have no bearing, and there is no consideration of what I want or what I desire, but what I must do, what I ought to do.
Prabhupāda: No. Morality varies according to the development of the particular society. There are so many immoral things going on in the particular type of society which are very, very immoral, but they do not care for it; they do it.
Śyāmasundara: There is no universal morality?
Prabhupāda: Universal morality is to obey God, that's all. This is universal morality.
Śyāmasundara: But are any of God's laws fixed...
Prabhupāda: That is included. If you obey God, then all the laws are also included. That is the universal morality. Man-manā bhava mad-bhakto mad-yājī māṁ namaskuru: (BG 18.65) "Just become My servitor, always think of Me, just offer obeisances unto Me," that is morality.