"To assume" things should not be the why, the when, the how.
To think we know something about something should just makes us more aware how small is our vision of the big picture. And I mean that from about every angle: people, the meaning of life, situations, universe, etc. One day you think you have all figured it out, the next day...another question comes your way.
Just because... the more you know, the more you know how little you really know.