We pass for what we are.
If being "iron headed" is to be lacking such feelings, then Kant's position is that an ironheaded person could not be a moral agent because such a person would not be rational.
I could identify for virtually every important figure in the history of modern continental philosophy an idea (or more than one) absolutely central to that philosopher's thought, whose original author was Fichte.
I think Fichte did take it further than Kant by arguing that we can regard the moral law as objectively valid only by seeing it as addressed to us by another being, even though Fichte thought God could not literally be a person who could address us.
Both Kant and Fichte thought of traditions of revealed religion as ways of symbolically (that is, with aesthetic emotional power) thinking about our moral condition. Both thought that religion would become more and not less powerful, emotionally and morally, if the claims of scriptures and religious teachings were taken symbolically rather than literally (whatever 'literally' might mean in the case of claims that are either nonsensical or outdated or historically unsupportable if taken as metaphysical or historical assertions).
It is a culturally interesting (but also deeply depressing) fact that many religious claims seem to retain their emotional power for believers only if taken in ways that are intellectually unsupportable and even morally contemptible.
It is a cause of shame to any member of the human race to be a member of the same species some of whose members could vote for any candidate for president that has been offered by the Republican party. Such people seem to be motivated only by short-sighted greed, ignorance, fear and hatred.
Fear of death is worse than dying.
I like the opportunity to make films.
Maybe you shouldn't be working as a jailer in Guantánamo. Maybe that's why you feel spiritually unhealthy.
One paire of eares drawes dry an hundred tongues.