Continuity of life means continual readaptation of the environment to the needs of living organisms.

In laying hands upon the sacred ark of absolute permanency, in treating the forms that had been regarded as types of fixity and perfection as originating and passing away, the Origin of Species introduced a mode of thinking that in the end was bound to transform the logic of knowledge, and hence the treatment of morals, politics, and religion.

It may be said that an education which does not succeed in making poetry a resource in the business of life as well as in its leisure, has something the matter with it.

We rarely recognize the extent in which our conscious estimates of what is worth while and what is not, are due to standards of which we are not conscious at all.

Like the soil, mind is fertilized while it lies fallow, until a new burst of bloom ensues.

All genuine learning comes through experience.

Nature as a whole is a progressive realization of purpose strictly comparable to the realization of purpose in any single plant or animal.