There is no know-it-all

All knowledge is borrowed and partially understood.

There are those who think they know - we call them experts until we hit upon their threshold.

There are those who are comfortable with what know - we call them ignorant.

There are those who pretend to know everything - we call them teachers.

There are those who acknowledge they know not everything - we call them innocent.

There are those who know they don't know everything - they are non-existent.