I am decidedly of the opinion that in very many instances we can trace such a necessary connexion, especially among birds, and often with more complete success than in the case which I have here attempted to explain.
Modification of form is admitted to be a matter of time.
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.
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.
There is, I conceive, no contradiction in believing that mind is at once the cause of matter and of the development of individualised human minds through the agency of matter.
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.
What we need are not prohibitory marriage laws, but a reformed society, an educated public opinion which will teach individual duty in these matters.
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.
I am thankful I can see much to admire in all religions.
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.
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.
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.
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.
The foregoing considerations lead us to the very important conclusion, that matter is essentially force, and nothing but force; that matter, as popularly understood, does not exist, and is, in fact, philosophically inconceivable.
Civilisation has ever accompanied emigration and conquest - the conflict of opinion, of religion, or of race.
I have since wandered among men of many races and many religions.
I hold with Henry George, that at the back of every great social evil will be found a great political wrong.
To the mass of mankind religion of some kind is a necessity.
Truth is born into this world only with pangs and tribulations, and every fresh truth is received unwillingly.