Justice is not always an open and shut case - sometimes we have to work for it. If you want peace, you must work for justice.
For peace is not simply the absence of warfare, based on a precarious balance of power; it is fashioned by efforts directed day after day toward the establishment of the ordered universe willed by God, with a more perfect form of justice among men.
If the world is made to furnish each individual with the means of livelihood and the instruments for his growth and progress, each man has therefore the right to find in the world what is necessary for himself. The recent Council reminded us of this: "God intended the earth and all that it contains for the use of every human being and people. Thus, as all men follow justice and unite in charity, created goods should abound for them on a reasonable basis."