In the early 1920s, she leaves that narrow but secure world behind when she goes to Paris and gradually adapts to the very different life there, centering for her and her female compatriots on art, fashion, Dada, dancing, and love affairs.

The same year, he published Notre drôle d'époque comme si vous y étiez ("Those Funny Times of Ours; As If You Were There"), a characteristically sarcastic and politically conservative collection of anecdotes about TV, love, religion and many other topics, in which he invites the readers to smile at their own habits and way of life.

In 1978, he wrote Lettres à votre fils qui en a ras le bol ("Letters to your Fed-Up Son"), a "love-letter" to the new generation, praising their cheerfulness in the face of adversity.

He systematically broached topical issues: relationships with the past and future, school life, tobacco, hi-fi, sex, coming of age at 18, homosexuality, speeding, drugs, unemployment, manual work, girls, and love.

Three years later, his Lettre ouverte aux futurs illettrés ("Open Letter to Illiterates to Be ") returns to the same theme, expressing admiration for the young people he had taught, while blaming a poor school system for their subsequent disadvantaged position.

Guth also helped develop books for children, including Les Passagers de la Grande Ourse ("The Passengers of Ursa Major", 1944) with Paul Grimault, which tells the story of Gô and his little dog Sniff on board an airship.