“Forcefully promoting your accomplishments gives off the appearance that you didn’t think that you deserved them and that you’re not good enough.”

Who said it, and where.

Who said “Forcefully promoting your accomplishments gives off the appearance that you didn’t think…”? Isaac Mashman wrote it in Personal Branding: A Manifesto on Fame and Influence, Second Edition (2025), Section 8.1, Integrity, Etiquette, and Taking Credit.