I consider Christian theology to be one of the great disasters of the human race.

Every organism requires an environment of friends, partly to shield it from violent changes, and partly to supply it with its wants.

The true method of discovery is like the flight of an aeroplane. It starts from the ground of particular observation; it makes a flight in the thin air of imaginative generalization; and it again lands for renewed observation rendered acute by rational interpretation.

The progress of Science consists in observing interconnections and in showing with a patient ingenuity that the events of this ever-shifting world are but examples of a few general relations, called laws. To see what is general in what is particular, and what is permanent in what is transitory, is the aim of scientific thought.

Philosophy is the self-correction by consciousness of its own initial excess of subjectivity.

The safest general characterization of the European philosophical tradition is that it consists of a series of footnotes to Plato.

Life is complex in its expression, involving more than percipience, namely desire, emotion, will, and feeling.