The law is the survival of the fittest.... The law is not the survival of the 'better' or the 'stronger,' if we give to those words any thing like their ordinary meanings. It is the survival of those which are constitutionally fittest to thrive under the conditions in which they are placed; and very often that which, humanly speaking, is inferiority, causes the survival.

Progress is not an accident, not a thing within human control, but a beneficent necessity ... due to the working of a universal law. So surely must the things we call evil and immorality disappear; so surely must man become perfect.

... those who have never entered upon scientific pursuits know not a tithe of the poetry by which they are surrounded... Sad, indeed, is it to see how men occupy themselves with trivialities, and are indifferent to the grandest phenomena - care not to understand the architecture of the heavens, but are deeply interested in some contemptible controversy about the intrigues of Mary Queen of Scots!

Only when Genius is married to Science can the highest results be produced.

If they are sufficiently complete to live, they do live, and it is well they should live. If they are not sufficiently complete to live, they die, and it is best they should die.

Feudalism, serfdom, slavery — all tyrannical institutions, are merely the most vigorous kinds of rule, springing out of, and necessary to, a bad state of man. The progress from these is in all cases the same — less government.

That feelings of love and hate make rational judgments impossible in public affairs, as in private affairs, we can clearly enough see in others, though not so clearly in ourselves.