Black board is symbol for readiness to learnGenerally, a teacher goes to school to teach lessons to students. It is common to be known by everyone. But, here is a philosophical thought involved when the teacher entered the classroom. Before putting a piece of chalk on the blackboard, the teacher has written something on the blackboards of each student with his gestures and activities. That means before starting a lesson to students, the teacher gives some motivational points which already known by the students. To trigger such points, the teacher writes that triggering points on the blackboards of students. Here one thing to understand. Each and every student's brain is a blackboard. Actually, it is not blackboard because whenever a trigger is activated on the brain, the student recollects it from his daily experiences in his house or society. After completion of this activity, then the only the teacher uses blackboard to enter into the world of a new lesson.
As elders, our minds are also blackboards because we are suffering from six enemies internally. Our effort could not be more to defeat them. To prevent and fight against those enemies, Guru is necessary to trigger self-knowledge bestowed on us.