Take a step often involves re-start, rebirth, reinvention. Given the uncertainty of future events as we stop will be triggered. Many times we reject the advance, embracing conformity and crossing out unnecessary adventure.
The mind is boycotting us with the fear of the unknown, the new, but there is a possibility that feeds this fear much more than the future uncertainty.
The memories of the past.
Before the new door that opens our mind reminds us how often failed in the past, connects us with negative experiences and limiting beliefs of our environment.
No mind, with your clarity, you must break with the past. Even with your own creations, for fear of losing what you have not let you have more.
What you have achieved in life is just one more step that leads you to the rest of it.
Leave behind wisely remembering that knowledge has on you. You will not find you need to know in front or behind, neither up nor down. Your innate intelligence knows where and when to move.