BIG is a little word with a big meaning. We may be a small fish in a pond full of others but we can determine the size of the pond we live in by the dimensions of the vision we have for ourselves.
If we confine the thoughts we have we will restrict our potential whereas expansive thoughts can see us achieve things way beyond that which we thought we were capable.
Aim high. If you settle for average expectations you will fall below even average. If you aim over and above what you think is your capability you will succeed. In business, organise your goals into bite-size chunks and try to nibble your way at them in a structured way. That way you can make what may appear an insurmountable task achievable.