Ignorance more frequently begets confidence than does knowledge: it is those who know little, and not those who know much, who so positively assert that this or that problem will never be solved by science.
With highly civilised nations continued progress depends in a subordinate degree on natural selection; for such nations do not supplant and exterminate one another as do savage tribes.
We are not here concerned with hopes or fears, only with the truth as far as our reason allows us to discover it.
Ultimately our moral sense or conscience becomes a highly complex sentiment – originating in the social instincts, largely guided by the approbation of our fellow-men, ruled by reason, self-interest, and in later times by deep religious feelings, and confirmed by instruction and habit.
They might insist that they were ready to aid their fellow-apes of the same troop in many ways, to risk their lives for them, and to take charge of their orphans; but they would be forced to acknowledge that disinterested love for all living creatures, the most noble attribute of man, was quite beyond their comprehension.
The moral faculties are generally esteemed, and with justice, as of higher value than the intellectual powers.
The highest possible stage in moral culture is when we recognize that we ought to control our thoughts.
The difference in mind between man and the higher animals, great as it is, is certainly one of degree and not of kind.