the style is the man
Proverb meaning that a person's writing style reflects their character. Originates from a quote by Georges-Louis Leclerc (Buffon).
The saying 'the style is the man' means that a person's character is revealed in their writing.
A Japanese translation of Buffon’s French maxim le style est l’homme même, “the style is the man himself,” from his 1753 discourse on style.