Beware the man of a single book.

Peace is the work of justice indirectly, in so far as justice removes the obstacles to peace; but it is the work of charity (love) directly, since charity, according to its very notion, causes peace.

I cannot go on.... All that I have written seems to me like so much straw compared to what I have seen and what has been revealed to me.

He suddenly announced that he could not write any more since "All that I have written seems like straw to me."

It is necessary for the perfection of human society that there should be men who devote their lives to contemplation.

If the highest aim of a captain were to preserve his ship, he would keep it in port forever.

One aspect of neighbourly love is that we must not merely will our neighbours good, but actually work to bring it about.