No man will make a great leader who wants to do it all himself or get all the credit for doing it.

I shall argue that strong men, conversely, know when to compromise and that all principles can be compromised to serve a greater principle.

The price which society pays for the law of competition, like the price it pays for cheap comforts and luxuries, is great; but the advantages of this law are also greater still than its cost- for it is to this law that we owe our wonderful material development, which brings improved conditions in its train.

There is not such a cradle of democracy upon the earth as the Free Public Library, this republic of letters, where neither rank, office, nor wealth receives the slightest consideration.

My hopes were high, and I looked every day for some change to take place. What it was to be I knew not, but that it would come I felt certain if I kept on. One day the chance came.

I will give a million dollars for any convincing proof of a future life.

The more difficult a problem becomes, the more interesting it is.