I just noticed this on netflix the other day and was meaning to watch it. I also like the message but it has to be combined with action and i think you kinda brought up another great point which is you have to be somewhat self aware and go after things your strong at and dont think you can be a professional basketball player if your 4'10".

steve harvey who has a lot of popular motivational speeches is a big proponent of the secret and positive thinking but he also says follow your god given strengths and not necessarily your passions. he says he loves golf but he sucks at it. his strength is talking and making people laugh and telling stories