This overcome your weaknesses quote reads:
Weaknesses exists because thoughts of inadequacy give them life. Only through effort and failure will they ever become strengths.
To succeed, you must fail.
Your weaknesses keep you back from trying
Not (“trying”) will keep you from developing your skills.
If you think that you can’t, you won’t.
If you want to become strong in something, learn new skills than start thinking you can.
You won’t be the best at first.
In time you will though… if you keep putting in the work.