Responding to Pope John Paul II's call to give the "ethical grounds and personalistic reasons" behind the Church's teaching on sexual morality, this reflection written over the span of two articles analyzes the norms of the natural law related to human sexuality from a personalist perspective. The key ideas of this study are drawn from two passages: one from Gaudium et spes which states that "The sexual characteristics of man and the human faculty of reproduction wonderfully exceed the dispositions of lower forms of life", the other from Humanae vitae stating that "Conjugal love reveals its true nature and nobility when it is considered in its supreme origin, God, who is love … and it is of supreme importance to have an exact idea of these." Part I provides an overview of natural law theory, explaining what it means that the natural law is not arbitrary, but the moral norms governing our actions in relation to the beings in the world are rooted in the nature and value of those things. Second, on the background of John Paul II's idea that "the body is the person," this article brings to light a type of bodily act (which I call an "embodying act") that is not only bodily, but one that forms an organic union with an act of the spirit. Finally, we examine here the nature of love as consisting of two dimensions: of mutual self-giving as well as the fruitfulness arising from mutual self-gift. The analysis of "embodying acts" together with the analysis of love will be crucial for arriving at one of the main conclusions in Part II, namely, that the Church's moral norms governing the use of the spousal act are not grounded in the biological structure of sex, but in the laws of love.
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