Many believe that the power of now will be attained when you quiet the mind and try to stop thinking about your past or your future. Particularly if you stop worrying about the future. This does not make sense.
When you reflect on your past properly and when you realize how it made you grow, and when you see how you have learnt from past mistakes and troubles, you will outomatically stop worrying about the future and begin living in the eternal now.
When you learn this, you will also learn how the eternal moment is part of your eternal soul, and your destiny will begin to reveal itself.