Both are lost through original sin, which, in form, is the "loss of original righteousness." The consequence of this loss is the disorder and maiming of man's nature, which shows itself in "ignorance; malice, moral weakness, and especially in "concupiscentia, "which is the material principle of original sin." The course of thought here is as follows: when the first man transgressed the order of his nature appointed by nature and grace, he (and with him the human race) lost this order. This negative state is the essence of original sin. From it follow an impairment and perversion of human nature in which thenceforth lower aims rule, contrary to nature, and release the lower element in man.