Assertion: brown's time | /r/HasProperty | the essence
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Source sentences:
text: This book, published in 2009, continues the themes of his earlier books, and is written as a final warning call for the leaders of the world to begin "mobilizing to save civilization" and stresses even more that time is of the essence.
text: If time is of the essence and you feel you need to appear in person, please call the office for an appointment.