Looking for a Rule to Keep in Order to Please God

A story is told out of the orient of a young Buddhist monk who sat outside his temple two thousand years ago, hands clasped in prayer.  He looked very pious and he chanted 'Amita Buddha' all day.  Day after day he intoned these words, believing that he was acquiring grace.

One day the head priest of the temple sat next to him and began rubbing a piece of brick against a stone.  Day after day he rubbed one against the other.  This went on week after week until the young monk could no longer contain his curiosity, and he finally blurted out, "Father, what are you doing?"

"I'm trying to make a mirror," said the head priest.

"But that's impossible!" said the young monk. "You can't make a mirror from brick."

"True," replied the head priest. "Just as it is impossible to acquire grace by a chant."