Follow humbly wherever and to whatever abyss Nature leads, or you shall learn nothing.

Agnosticism simply means that a man shall not say that he knows or believes that for which he has no grounds for professing to believe.

Social progress means a checking of the cosmic process at every step and the substitution for it of another, which may be called the ethical process; the end of which is not the survival of those who may happen to be the fittest, in respect of the whole of the conditions which obtain, but of those who are ethically the best.

Economy does not lie in sparing money, but in spending it wisely.

That which endures is not one or another association of living forms, but the process of which the cosmos is the product, and of which these are among the transitory expressions.

God give me strength to face a fact though it slay me.

I have never had the least sympathy with the a priori reasons against orthodoxy, and I have by nature and disposition the greatest possible antipathy to all the atheistic and infidel school. Nevertheless I know that I am, in spite of myself, exactly what the Christian would call, and, so far as I can see, is justified in calling, atheist and infidel.