Do you think that people are able to access a variety of levels of thinking?

I think that everybody has a different level of thinking, but I have a hard time accepting or believing that some people just think shallowly and do not access any deeper thoughts or realizations…that they are just common people. Maybe everyone has the ability to access this deep level of consciousness but not all know how to do so? But if they do not know how to access it then they lack the ability don’t they? Help me expand my analysis on this topic please, if you can!