Happiness is worth a daring deed; we are both free if we but will it, and then the game is won.

One of the qualities of liberty is that, as long as it is being striven after, it goes on expanding. Therefore, the man who stands in the midst of the struggle and says, 'I have it,' merely shows by doing so that he has just lost it.

But a scientific man must live in a little bit of style.

Money may be the husk of many things but not the kernel. It brings you food, but not appetite; medicine, but not health; acquaintance, but not friends; servants, but not loyalty; days of joy, but not peace or happiness.

HELMER; But this is disgraceful. Is this the way you neglect your most sacred duties? NORA: What do you consider is my most sacred duty? HELMER: Do I have to tell you that? Isn't it your duty to your husband and children? NORA:I have another duty, just as sacred. HELMER: You can't have. What duty do you mean? NORA: My duty to myself.

Castles in the air - they are so easy to take refuge in. And so easy to build too.

Each bird must sing with his own throat.