To this must be added that ...

To this must be added that the hiring of labor and the conduct of trade are concentrated in the hands of comparatively few; so that a small number of very rich men have been able to lay upon the teeming masses of the laboring poor a yoke little better than that of slavery itself.
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 Pope Leo XIII

Quotes from the same author

O Virgin most holy, none abounds in the knowledge of God except through thee; none, O Mother of God, obtains salvation except through thee, none receives a gift from the throne of mercy except through thee.
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 Pope Leo XIII
No human law can abolish the natural and original right of marriage, nor in any way limit the chief and principal purpose of marriage ordained by God’s authority from the beginning: Increase and multiply.
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 Pope Leo XIII
To the shepherds alone was given all power to teach, to judge, to direct; on the faithful was imposed the duty of following their teaching, of submitting with docility to their judgment, and of allowing themselves to be governed, corrected, and guided by them in the way of salvation. Thus, it is an absolute necessity for the simple faithful to submit in mind and heart to their own pastors, and for the latter to submit with them to the Head and Supreme Pastor.
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 Pope Leo XIII
For when men know they are working on what belongs to them, they work with far greater eagerness and diligence. Nay, in a word, they learn to love the land cultivated by their own hands, whence they look not only for food but for some measure of abundance for themselves and their dependents. All can see how much this willing eagerness contributes to an abundance of produce and the wealth of a nation.
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 Pope Leo XIII
Whoso turns his attention to the bitter strifes of these days and seeks a reason for the troubles that vex public and private life must come to the conclusion that a fruitful cause of the evils which now afflict, as well as of those which threaten us, lies in this: that false conclusions concerning divine and human things, which originated in the schools of philosophy, have crept into all the orders of the state, and have been accepted by the common consent of the masses.
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 Pope Leo XIII