Sona who was an affluent’s son in Campa City was ordained as a monk and strictly practiced his walking meditation until his feet bled. Even so, he did not reach the Enlightenment. Then he considered about his property and disrobing to simply live as a layman. When the Buddha realized his thought, he talked to Monk Sona and advised him to continue his meditation by following the middle path. Monk Sona accepted to do and eventually attained the Enlightenment.