what is the key to any success ?

It is a fascinating theme . I have been reading recently about Bill Bartmann . A businessman . A billionaire who went a long way right from the guts , from the bottom of street gangs , being homeless to becoming the 25th wealthiest person in America . He certainly knows the key .
When I look at high achievers I see clearly that it is just one step from being crazy , poor , homeless to achieving everything one desires . both sides are just the opposite sides of the same coin . what makes the difference ....?
it is FOCUS . and something more , that precedes focus
and that something makes the whole life become joy or misery

it is - " I am "