You shall love the Lord your God with all your heart, and with all your soul, and with all your strength, and with all your mind; and, love your neighbor as yourself.
Your neighbor is a Person – the highest possible good, along with God. Your neighbor’s supreme value comes from the fact that he is made in the image of God, with an immortal soul and shares in God’s eternal nature.
Kant gets close to this when he writes “treat yourself and others always as an end, and never merely as a means.” However, Kant posits the moral law as of supreme value. It is possible to see that this is where his true devotion lies. This is the fatal mistake of elevating something higher than the individual, concrete, Person in conjunction with God. This accounts for the intuition that there is something ascetic, forbidding and anti-human in Kant and his willingness to seek to achieve an illusory moral purity, through, for instance, never lying under any circumstances; a moral purity being unattainable in a fallen world.
In the hypothetical situation of a would-be murderer coming to the door of a house and asking if Steve the prospective victim is home, Kant argues that, even if Steve is in fact home, the would-be murderer should be told the truth. Kant contends that the householder would be morally innocent of contributing to Steve’s death in this case. However, if he lies and says that Steve is not home, but he is in fact mistaken and thus contribute to the murderer finding and killing Steve, he will now be held morally culpable. The fact that protecting innocent life is actually more important than lying in this context as most people can see, means that Kant has elevated the moral law above the value of the life of the individual person. Kant treats moral purity as paramount.
Kant, the Idealist, directs his affection at an abstraction; not the individual Person.
Berdyaev writes: “In his doctrine of the Categorical Imperative and the pure moral will Kant had already embarked upon the path of denying the soul, the living concrete man. Thus an ideal norm, an ideal value, becomes a means of suppressing man and his emotional life. The spiritual life is truth, but it is also the life of man, of the whole man. The elimination of the human element in the name of either an ascetic war against sin or some ideal value is equally perverse, false and sinful.”(Spirit and Reality, p. 40)
Kant adopts the typical error of the intellectual in identifying the soul, and thus the valuable in man, with the intellectual component only as can be seen with his Kingdom of Ends entered via rationality.
Any higher value other than Person and God ends up being sacrificial and in principle, murderous. This alternative postulated value expresses the willingness to sacrifice the Person in the name of this highest value; ironically enough, in this case, the moral law.