Knowing18

When a student is ready,
the Master rises in front of him.

How the master knows the students are ready. 
Simply, a thief knows about rich people. Once you become stinking rich, the thief rises in front of you. 
Here the Master rises to steal the innocence of the student.

The master was once a student, the learner always looking for a search and the master was pregnant with wisdom, looking for the place to deliver. The Master and the student live on the same platform. 

Why Master need a student rather than a student need a master. The truth, like a seed, needs a place to grow and branch out to yield fruits to this world. 
There is no pride in becoming a student when there is no master around coz there is no master in a student But 
In the case of a Master, there is always a student inside of him. 
First he was a student then he became a master.

Normally, When the master preaches his disciples. Actually he is preaching to a disciple inside of him. there is no outer and inner in master. When a disciple asks a question, it arises from the master. The master was the one who made his student raise a question , hence he can teach to a student who resides inside of him.

If you watch the master answering the question, you can see there is so much joy in him. Why? Actually he raised the question from inside and answered on his own. Though 
It may look other way there is a Q & A session between the Master and the Student. 
The session of Q&A, where master and student enter in one another, and become one.

In Short,
A master is a complete person, there is a student and master in him. but to the world they are two different people. They are more like lovers, why? Coz both become one and they already one arise from another. When you become a student, soon you will become a master, it is inevitable and 
Once you become a master there is always a student inside and outside of you. That’s why the master can identify a student and go and stand in front of him. But a student can’t recognize the Master because of his mind in search of a Perfect Master.

The Good Master is not answering your question, actually he is questioning the questioning in you hence you will find the answer.