We cannot always control our thoughts, but we can control our words, and repetitionimpresses the subconscious, and we are then master of the situation.
The ear tends to be lazy, craves the familiar and is shocked by the unexpected; the eye, on the other hand, tends to be impatient, craves the novel and is bored by repetition.
Conflictis the gadfly of thought. It stirs us to observation and memory. Itinstigates to invention. It shocks us out of sheeplikepassivity, and sets us at noting and contriving.