You . . . put on fear and cast yourself in wonder The first meaning of cast is "throw," and in Shakespeare's time the word "put" retained its original meaning of "thrust." Cassius is saying that Casca has thrust himself into fear and thrown himself into wonder. Cassius wants Casca to be as he boasts he is, one who has nothing to fear, because he is an honest man, and nothing to wonder at, because he understands that all of the terrible portents point at the crimes of Caesar.