In George Bernard Shaw's play "Saint Joan," the quote emphasizes the difficulty of accepting the truth due to its complicated presentation. It suggests that truth is often masked by various interpretations and embellishments, making it hard for people to digest. This metaphorical 'sauce' represents the biases and opinions that accompany the truth, obscuring its essence.

Shaw urges that to truly grasp the truth, one must confront it in its pure form, devoid of any external influences. This clarity allows individuals to embrace the reality of a situation rather than the distorted perceptions influenced by societal pressures or personal biases. Ultimately, the quote calls for a return to unadulterated honesty for genuine understanding.