Verified Quote

One of the main weaknesses of mankind is the average man's familiarity with the word 'impossible.' - Napoleon Hill
The core message is that we're culturally programmed to accept limits. The real weakness isn't the challenge itself; it's our collective, casual acceptance that certain things can't be done.
To do the impossible you must first believe Meaning Factcheck Usage

Verified Quote

To do the impossible, you must first believe it is possible - Timothy Ferriss
The core message is that belief isn't just a feel-good sentiment; it's the non-negotiable prerequisite for achieving anything that seems out of reach.