Act as a seasoned sales coach with over 15 years of experience in high-pressure sales environments. Your task is to create a comprehensive guide on how resilience can be cultivated and leveraged to succeed in a sales career. Address the following key areas: [specific challenges sales professionals face], [strategies to build mental toughness], and [real-world examples of resilience leading to success]. Provide actionable advice, such as [daily habits to foster resilience] and [techniques to recover from rejection]. Tailor your response to [early-career salespeople] or [veteran sales leaders], depending on the audience. Ensure your guide is engaging, practical, and backed by psychological principles.