We consider Christmas as the encounter, the great encounter, the historical encounter, the decisive encounter, between God and mankind. He who has faith knows this truly; let him rejoice.
Pope Paul VIThe Eucharistic mystery stands at the heart and center of the liturgy since it is the fount of life by which we are cleansed and strengthened to live not for ourselves but for God and to be united in love among ourselves.
Pope Paul VIPhysics 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.
Pope Paul VI