Behold, the fool saith, "Put not all thine eggs in the one basket" - which is but a matter of saying, "Scatter your money and your attention"; but the wise man saith, "Pull all your eggs in the one basket and - WATCH THAT BASKET." - Pudd'nhead Wilson's Calendar
A powerful agent is the right word. Whenever we come upon one of those intensely right words in a book or newspaper the resulting effect is physical as well as spiritual, and electrically prompt.
When an honest writer discovers an imposition it is his simple duty to strip it bare and hurl it down from its place of honor, no matter who suffers by it; any other course would render him unworthy of the public confidence.