There is a tendency in nature to the continued progression of certain classes of varieties further and further from the original type.
The life of wild animals is a struggle for existence. The full exertion of all their faculties and all their energies is required to preserve their own existence and provide for that of their infant offspring.
If this is not done, future ages will certainly look back upon us as a people so immersed in the pursuit of wealth as to be blind to higher considerations.
But naturalists are now beginning to look beyond this, and to see that there must be some other principle regulating the infinitely varied forms of animal life.
In my solitude I have pondered much on the incomprehensible subjects of space, eternity, life and death.
To expect the world to receive a new truth, or even an old truth, without challenging it, is to look for one of those miracles which do not occur.
Truth is born into this world only with pangs and tribulations, and every fresh truth is received unwillingly.
On the spiritual theory, man consists essentially of a spiritual nature or mind intimately associated with a spiritual body or soul, both of which are developed in and by means of a material organism.
To say that mind is a product or function of protoplasm, or of its molecular changes, is to use words to which we can attach no clear conception.
Modification of form is admitted to be a matter of time.
Every species has come into existence coincident both in space and time with a pre-existing closely allied species.
In all works on Natural History, we constantly find details of the marvellous adaptation of animals to their food, their habits, and the localities in which they are found.
It has been generally the custom of writers on natural history to take the habits and instincts of animals as the fixed point, and to consider their structure and organization as specially adapted to be in accordance with them.
I spent, as you know, a year and a half in a clergyman's family and heard almost every Tuesday the very best, most earnest and most impressive preacher it has ever been my fortune to meet with, but it produced no effect whatever on my mind.
What we need are not prohibitory marriage laws, but a reformed society, an educated public opinion which will teach individual duty in these matters.