"Kill them with success" signifies using one's accomplishments and achievements to silence critics or naysayers. Instead of engaging in verbal battles, the idea is to let your success speak for itself, proving your capabilities and determination.
"And bury them with a smile" adds a layer of grace and resilience. It suggests that even when faced with negativity or jealousy, maintaining a positive demeanor is essential. Burying detractors with a smile implies rising above negativity and showing that their opinions or actions hold no power over your attitude.
In essence, this statement promotes the idea of focusing on personal growth, accomplishments, and positivity. It encourages individuals to channel their energy into achieving their goals, letting their success be the ultimate response to those who doubt or criticize, all while maintaining an unwavering and gracious demeanor.