Charlie Day is the co-creator of TV’s longest-running live-action sitcom, “It’s Always Sunny in Philadelphia,” the voice of Luigi in the box office hit “The Super Mario Bros. Movie,” and writer-director of the star-studded new comedy “Fool’s Paradise.” And he wants any creatives looking to emulate that success know that the doubt never goes away—you just have to use it. "You're gonna be filled with self doubt. Because you're not a mathematician; there's no equation at the end of your work where you're going to say, ‘oh great, it equalled nine. I knew it,’” Day says. “You have to come up with your own equation, and say ‘purple plus blue plus John Malkovich plus Jon Brion equals nine for me. Now I feel satisfied.’ It's just a series of risks you have to take. But that's why you do it, right?” In this episode of In the Envelope: The Actor’s Podcast, Day takes us through his creative process both in front of and behind the camera. This episode is sponsored by Voice123, the first online marketplace for voice actors with over 30,000 projects of all genres flowing through annually. Got a creative project you’d like to bring to life? Download our free step-by-step guide at voice123.co/intheenvelope to successfully find the right voice for your projects! Hire a voice actor by signing up at voice123.com for a free account and posting your projects today! -- Backstage has been the #1 resource for actors and talent-seekers for 60 years. In the Envelope, Backstage’s podcast, features intimate, in-depth conversations with today’s most noteworthy film, television, and theater actors and creators. This is your guide to every aspect of acting, from voiceover and commercial work to casting directors, agents, and more. Full of both know-how and inspiration, In the Envelope airs weekly to cover everything from practical advice on navigating the industry, to how your favorite projects are made, to personal stories of success and failure alike. Join host Vinnie Mancuso, senior editor at Backstage, for this guide on how to live the creative life from those who are doing it every day: https://bit.ly/2OMryWQ Follow Backstage and In the Envelope on social media: - https://www.facebook.com/backstage - https://www.twitter.com/backstage - https://www.twitter.com/intheenvelope - https://www.instagram.com/backstagecast Looking to get cast? Subscribe here: www.backstage.com/subscribe Browse Backstage casting listings: https://bit.ly/3mth68e Check out our community-driven virtual programming, The Slate: https://bit.ly/2WDNXf0 Backstage stands in solidarity with the Black Lives Matter movement: https://bit.ly/3cuMBt5 Special thanks to... - Host: Vinnie Mancuso - Producer: Jamie Muffett - Social media: Karen Jenkins - Design: Mark Stinson, Caitlin Watkins - Additional support: Kasey Howe, Samantha Sherlock, Oriella St. Louis