One Eye

A young boy came to an old teacher to learn martial arts. That old teacher was one of the best teachers in the country at that time.
โTeacher, can I be the best martial artist in the country if I trained under you?โ asked the student.
โCertainly โฆโ replies the teacher.
โHow many years would it take?โ
โAbout ten years.โ
โThatโs too long. If I practice with you daily, how many years would it take?โ
โTwenty years.โ
โIf I train with you three times a day on each day, how many years would it take?โ
โThirty years.โ
โHow would it be โฆ When I am training more times, it must be shortened.โ the student asked with wonder.
โYou are already watching your final aim with one eye. So, how could you go your journey with the other single eye?โ
Zen Story Sent by Dharmendra Tathastu