Sexual tendency provides matter to love, but involves conscience and will; for instance, in marriage the probability of procreation is already a choice that participates to creation in a personal and indissoluble way; on the contrary, the unwillingness to generate deprives the love of value and reduces the union to a selfish enjoyment.
Justice to the Creator demands responsibility for love, with respect for the natural order and giving each other a gift.
This vocation requires determination in inner development and commitment in service to the values of life; having seen the demand for his or her own gift, the person asserts himself or herself in the freedom to act up the self-giving out of love.
Each one is called to respond to the love of the Creator by inserting himself or herself into the action of God, the supreme model of love, fatherhood and motherhood.
This appeal to perfection (ref. Mat 5:48) can be welcomed with good will, striving to implement the contributions expected by our neighbor and by God; welcoming His parenting image we become His children.