I believe this is the #1 thing that many teachers forget to do that ultimately sets themselves up for failure.
Teachers can sometimes get too excited and caught up with the material. Sometimes they're just there to make sure the student "absorbs" all the information.
But they never consider the fact that they forgot to MAKE A CONNECTION.
The most powerful motivator for people is feeling valued as a human being. If you're a parent, make sure your kid feels appreciated. If you're at your job, make each and every customer feel special. If you're a boss, develop meaningful relationships with your employees.
Even though I love my parents to death and am extremely grateful for how they raised me and provided for the family, I always longed for those words of praise and encouragement instead of having to do something to "be a good student" or "be a good son." It's something I take to heart and have made the #1 priority in my studio. Before they play a single key on the piano, and before you teach them anything music-related, make the student feel important no matter what.
If you're struggling to get your message across, remember to first value your student, child, brother, mother, employee, boss or friend. They'll thank you for it.