Human life is limited, but knowledge is limitless. To drive the limited in pursuit of the limitless is fatal; and to presume that one really knows is fatal indeed!
When an archer shoots for enjoyment, he has all his skill; when he shoots for a brass buckle, he gets nervous; when he shoots for a prize of gold, he begins to see two targets.
To be constant is to be useful. To be useful is to realize one’s true nature. Realization of one’s true nature is happiness. When one reaches happiness, one is close to perfection.
Look at this window: it is nothing but a hole in the wall, but because of it the whole room is full of light. So when the faculties are empty, the heart is full of light.
