I long to set foot where no man has trod before.

In the distant future I see open fields for far more important researches. Psychology will be based on a new foundation, that of the necessary acquirement of each mental power and capacity by gradation. Light will be thrown on the origin of man and his history.

Animals manifestly enjoy excitement, and suffer from annul and may exhibit curiosity.

we are always slow in admitting any great change of which we do not see the intermediate steps

It is scarcely possible to doubt that the love of man has become instinctive in the dog.

Till facts are grouped & called there can be no prediction. The only advantage of discovering laws is to foretell what will happen & to see bearing of scattered facts.

If I had my life to live over again, I would have made a rule to read some poetry and listen to some music at least once every week.