Beware of assumptions! Whatever you ''assume'' to be possible -- or impossible will have a tendency to become real for you.

Confronted with the impossibility of remaining faithful to one's beliefs, and the equal impossibility of becoming free of them, one can be driven to the most inhuman excesses.

If you must tell me your opinions, tell me what you believe in. I have plenty of doubts of my own.

Loving is half of believing.

The word ''belief'' is a difficult thing for me. I don't believe. I must have a reason for a certain hypothesis. Either I know a thing, and then I know it --I don't need to believe it.

The battle that never ends is the battle of belief against unbelief.

Men are disturbed not by things, but by the view which they take of them.

If we let ourselves believe that man began with divine grace, that he forfeited this by sin, and that he can be redeemed only by divine grace through the crucified Christ, then we shall find peace of mind never granted to philosophers. He who cannot believe is cursed, for he reveals by his unbelief that God has not chosen to give him grace.

He is dead in this world who has no belief in another.

What we need is not the will to believe, but the wish to find out.