The present Pope, Pius X, has quoted these words of his predecessor and agreed that workmen have a strict right in justice to a fair wage, time to fulfill their religious duties, and freedom from work unsuited to their age, strength, or sex.[3] The Rev. J. Kelleher, one of the most recent and respected writers on the question, goes even further. "_The right to work_," he says, "or some other right that will secure an opportunity of providing for reasonable living to the less fortunate members of the social body who do not happen to be possessed of property, is an essential condition of any equitable economic system."[4] Cardinal Capecelatro has said that each one has "a right to raise himself towards the infinite, a right to the intellectual nourishment of religion, and, therefore, a right to the time necessary for the worship of God, a right to repose, a right to honest enjoyment, a right to love in marriage, and the life of the home. In woman Christianity recognizes with her function of child-bearing in Christian marriage, a right to the time for the nurture of her children. In children it recognizes a right to the supreme benefit of health, given them by God, but endangered by overmuch work. In young girls it recognizes a right to such moderation in their duties as may assure them health and strength. In all, finally, it acknowledges the immortal soul, with its rights to education, to salvation, to the time that these things need."[5] Now when Pope Leo and the other authorities quoted used the words "right," "just," "duty," what did they mean? These words are often employed vaguely and carelessly, but we may be sure that here they were taken in a strict and well-defined sense, such as usually found among Catholic ethicists. A right, as it is thus ordinarily defined, is "a legitimate power of doing or acquiring something for one's own good."[6] The word power is not taken here in the sense of physical ability. It means that moral potency or capacity without which nothing can be acquired or recovered: for a person may have a right to do what he has not the physical power to perform. "Legitimate" means granted by or conformable to law: hence we have not a right to do everything for which we have the physical power. Once we get this idea of "right" firmly fixed in our minds, the concepts of "justice," "injustice," and "duty" easily follow. For "justice," in a definition of Ulpian that has been accepted all down the ages since, is simply the constant and perpetual will of giving to each one his right.[7] And injustice, naturally, is merely a voluntary violation of another's right.