I know that philosophically a murderer is not responsible for his crime, but I prefer not to take tea with him.

Only the Catholic Church protested against the Hitlerian onslaught on liberty. Up till then I had not been interested in the Church, but today I feel a great admiration for the Church, which alone has had the courage to struggle for spiritual truth and moral liberty

I believe in standardizing automobiles, not human beings.

Persistence is the most powerful force on earth, it can move mountains.

Only the [Catholic] Church stood squarely across the path of Hitler’s campaign for suppressing truth. I never had any special interest in the Church before, but now I feel a great affection and admiration because the Church alone has had the courage and persistence to stand for intellectual truth and moral freedom. I am forced thus to confess that what I once despised I now praise unreservedly.

Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.

Thinking like we (always) have is what got us where we are. It is not going to get us where we are going.