Discourses, "How We Should Struggle Against Appearances" (§5)

“But in the first place, be not hurried away by the rapidity of the appearance, but say, Appearances, wait for me a little; let me see who you are, and what you are about; let me put you to the test. And then do not allow the appearance to lead you on and draw lively pictures of the things which will follow; for if you do, it will carry you off wherever it pleases. But rather bring in to oppose it some other beautiful and noble appearance, and cast out this base appearance. And if you are accustomed to be exercised in this way, you will see what shoulders, what sinews, what strength you have. But now it is only trifling words, and nothing more.”