WHAT A REALLY GOOD BRIDGE TEACHER NEEDS TO BE................... (  Based on an original work by of one of the world's greatest philosophers , Kahlil Gibran ) 

No doubt we all have views in this subject , on which on great deal of common ground can be found and agreed upon. 
However , I firmly endorse the words of Kahlil Gibran , who believed that no bridge teacher can reveal to his/her students anything " but that which already lies half asleep in the dawning of their knowledge ",  along with their innate feel for playing cards. A good teacher does not set to impart his knowledge and wisdom ,  but rather his enthusiasm and passion for the game.
Wisdom cannot be taught like algebraic equations , and so a good teacher will adopt the role of an inspirational guide ,  motivating students to go down the untrodden paths of understanding , which as it happens are mapped out in all the unexplored areas of their minds. 
" The musician may sing to you of the rhythm which is in all space , but he cannot give you the ear which arrests the rhythm , nor the voice that echoes it ".
So yes , a really good teacher will inspire and help you to commence that journey , and be there at the side of the road to utter words of reassurance , comfort and encouragement. But how one uses , efficiently and effectively , the kit bag of tools he/she handed out at the start depends , of course , on which paths are chosen and far along each road a student is prepared to travel .