Remember that metaphor you used back in the introductory section of your essay—an initial attempt to clarify your thesis? Let’s say your main idea is that we should cherish criticism because it helps us to grow. So you described the experience of receiving negative feedback as if it were a spring bud bursting into bloom. Such an image is most effective when it returns periodically, so use it a few more times early in the body of your essay, in relation to this or that sub-point of your argument. But remember that after a while, it’s a good idea to let the fanfare fade into the background, lest the bombast deafen the audience. Allow the image to rest in the back of the reader’s mind, while you continue to develop your theme in less figurative, more scholarly, evidentiary terms. Then, in your conclusion, bring your image back one last time. Our mind is still reeling with all that you’ve said since we last saw that little blossom, bulging with potential, and at precisely the right moment (we somehow expected it but it’s still a shock), your metaphor bursts into flower, revealing that it held more meaning than we thought possible only a few paragraphs before.