Making Time for Reflection

"A man who is very busy seldom changes his opinions." Friedrich Nietzche

What is Nietzche saying?  Perhaps he is referring to the importance of reflection.  Keeping busy seems to be a way to avoid reflection, and only with times of reflection can we consider if our beliefs and opinions are truly ours and ones that serve us.  I heard a neuroscientist say recently that 90% of our beliefs are unconscious and are not ones that support our values.  We can only know what we believe with reflection and consideration -- is our behavior in alignment with our values and goals?  If not, there is probably an unconscious belief controlling our behavior.