Overarching Societal Statements: Rather than using a traditional thesis statement you can put forth a societal observation that ties into the theme of your essay. This can be very effective if the statement is unique and gives a glimpse into how you view the world. It can be detrimental if your statement is debatable or unclear. Make sure that if you use this form of introduction that no admissions office will take offense to it.
Boswell wrote a good Book because he had a heart and an eye to discern Wisdom, and an utterance to render it forth; because of his free insight, his lively talent, above all, of his Love and childlike Open-mindedness. His sneaking sycophancies, his greediness and forwardness, whatever was bestial and earthy in him, are so many blemishes in his Book, which still disturb us in its clearness; wholly hindrances, not helps. Towards Johnson, however, his feeling was not Sycophancy, which is the lowest, but Reverence, which is the highest of human feelings.