"As in geology, so in social institutions, we may discover the causes of all past changes in the present invariable order of society."
"Beauty is composed of an eternal, invariable element whose quantity is extremely difficult to determine, and a relative element which might be, either by turns or all at once, period, fashion, moral, passion."
"I must take issue with the term 'a mere child,' for it has been my invariable experience that the company of a mere child is infinitely preferable to that of a mere adult."
"The invariable mark of wisdom is to see the miraculous in the common."
"If Christianity is not scientific, and Science is not God, then there is no invariable law, and truth becomes an accident."