Variable Efficacy

Famous quotes containing the words variable and/or efficacy:

“There is not so variable a thing in nature as a lady’s head-dress.”
—Joseph Addison (1672–1719)

“For books are not absolutely dead things, but do contain a potency of life in them to be as active as that soul was whose progeny they are; nay, they do preserve as in a vial the purest efficacy and extraction of that living intellect that bred them. I know they are as lively, and as vigorously productive, as those fabulous dragon’s teeth; and being sown up and down, may chance to spring up armed men.”
—John Milton (1608–1674)