Excessive economic, social and cultural inequalities among peoples arouse tensions and conflicts, and are a danger to peace.

Physics does not change the nature of the world it studies, and no science of behavior can change the essential nature of man, even though both sciences yield technologies with a vast power to manipulate the subject matters.

Having rationally endeavored to control nature, is he not now becoming the slave of the objects which he makes?

To wage war on misery and to struggle against injustice is to promote, along with improved conditions, the human and spiritual progress of all men, and therefore the common good of humanity. Peace cannot be limited to a mere absence of war, the result of an ever precarious balance of forces. No, peace is something that is built up day after day, in the pursuit of an order intended by God, which implies a more perfect form of justice among men.

Based on technological research and the transformation of nature, industrialization constantly goes forward, giving proof of incessant creativity. While certain enterprises develop and are concentrated, others die or change their location. Thus new social problems are created: professional or regional unemployment, redeployment and mobility of persons, permanent adaptation of workers and disparity of conditions in the different branches of industry.

The command to the Twelve to go out and proclaim the Good News is also valid for all Christians, though in a different way.... the Good News of the kingdom which is coming and which has begun is meant for all people of all times. Those who have received the Good News and who have been gathered by it into the community of salvation can and must communicate and spread it.

The pope-and we know this well-is without doubt the most serious obstacle on the ecumenical road.