Alfred Russel Wallace

Truth is born into this world only with pangs and tribulations, and every fresh truth is received unwillingly.

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.

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.

Civilisation has ever accompanied emigration and conquest - the conflict of opinion, of religion, or of race.

I am thankful I can see much to admire in all religions.

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.

I have since wandered among men of many races and many 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.

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.