We do injury to a child if we bring it up in a narrow Christianity, which prevents it from ever becoming capable of perceiving that there are treasures of purest gold to be found in non-Christian civilizations. Laical education does an even greater injury to children. It covers up those treasures, and those of Christianity as well.

If you want to know what a man is really like, take notice of how he acts when he loses money.

The joy of learning is as indispensable in study as breathing is in running.

Sin is nothing else but the failure to recognize human wretchedness.

Mathematics alone make us feel the limits of our intelligence. For we can always suppose in the case of an experiment that it is inexplicable because we don't happen to have all the data. In mathematics we have all the data, brought together in the full light of demonstration, and yet we don't understand. We always come back to the contemplation of our human wretchedness. What force is in relation to our will, the impenetrable opacity of mathematics is in relation to our intelligence.

science has now been for a long time - and to an ever-increasing extent - a collective enterprise. Actually, new results are always, in fact, the work of specific individuals; but, save perhaps for rare exceptions, the value of any result depends on such a complex set of interrelations with past discoveries and possible future researches that even the mind of the inventor cannot embrace the whole.

[We are not] to take one step, even in the direction of what is good, beyond that to which we are irresistibly impelled by God, and this applies to action, word, and thought.