World Voice Day (WVD) is observed annually on April 16 to celebrate the phenomenon of voice. The day aims to spread awareness about the importance of our vocal cords. It encourages people to use their voices to take care of it and use it for a good deed. On World Voice Day, we take a look at some powerful quotes on voice by popular people. From Malala Yousafzai to Friedrich Nietzsche, here is a list of people who believe in the power of voice.