Read Proverbs 23:12  Solomon talks about two things in our verse: instruction and knowledge.  What do you think is the difference between instruction and knowledge?  Knowledge means that you know some things, but instruction means that someone else is teaching you something about some things.  For example, knowledge is you knowing how to play the game of baseball but instruction is a coach who knows all about playing baseball teaching you how to play baseball.  Instruction needs two people: a teacher and a student.  One person who knows how to teach and another person who is willing to listen to that teacher.  But Solomon says two more things about instruction and knowledge: he says that we should apply our hearts to instruction and apply our ears to the words of knowledge.  Apply means to really work at something.  Solomon wisely tells us to really work at having a good attitude about listening to a teacher.  Our hearts means that we want to listen, and our ears mean that we pay attention and listen to what is being taught.  If we want to learn and we are attentive and listen, we will learn.  Remember, God gave us two ears and only one mouth.  Do you remember why?  So that we could listen twice as much as we talk.  And that is good advice.