“Are you more likely to doubt yourself when things are going great or are you more likely to doubt yourself when things aren't going your way?”

Who said it, and where.

Who said “Are you more likely to doubt yourself when things are going great or are you more likely…”? Isaac Mashman wrote it in Personal Branding: A Manifesto on Fame and Influence, Second Edition (2025), Section 3.6, Burnout and Competition.