In the kingdom of ends everything has either a price or a dignity. Whatever has a price can be replaced by something else as its equivalent; on the other hand, whatever is above all price, and therefore admits of no equivalent, has a dignity. But that which constitutes the condition under which alone something can be an end in itself does not have mere relative worth, i.e., price, but an intrinsic worth, i.e., a dignity.
Immanuel KantIn all judgements by which we describe anything as beautiful, we allow no one to be of another opinion.
Immanuel KantAlways recognize that human individuals are ends, and do not use them as means to your end.
Immanuel Kant