Saint Seraphim of Sarov was born in 1759, in city of Kursk. His parents were pious Orthodox Christians, examples of true spirituality. At the age of ten, Seraphim was miraculously healed from a serious illness by means of the Kursk icon of the Theotokos. As a boy, he immersed himself in church services and church literature. He began monastic life at the hermitage of Sarov at the age of nineteen. He was tonsured as a monk when he was twenty-seven, and soon afterwards was ordained a deacon. The intensity and purity of Seraphim's participation in the Divine services are evident as he was allowed to see angels, and during the liturgy on Holy Thursday, he saw the Lord Himself.
At thirty-four, Seraphim was ordained as a priest, and was assigned as the spiritual guide of the Diveyevo convent. At this time, he also received a blessing to begin life as a hermit in the forest surrounding Sarov. He lived in a small cabin, devoting himself entirely to prayer, fasting, and the reading of the Scriptures and the Holy Fathers. Seraphim would go to the monastery on Sundays to receive Holy Communion; and then return to the forest.
In 1804, Seraphim was attacked by robbers and almost beaten to death. Permanent injuries sustained from this attack caused him to always be bent over and the need of a staff to walk. After this event, the Saint began more fervent prayers, incessant for a thousand days and a thousand nights; spending the better part of his time kneeling on a stone near his cell crying out, "Lord, be merciful to me, a sinner." Then he then spent three years in absolute silent seclusion. Obeying the request of the elders of the monastery, Seraphim returned to the monastery in 1810, but continued to live in prayer, and silent seclusion for another ten years. In obedience to a heavenly vision, Seraphim ended his silence and began to speak for the benefit of others. The Saint greeted all who came to him with a prostration, a kiss, and the words of the Pascha greeting: "Christ is Risen!" He called everyone, "my joy." In 1825, he returned to his forest cell, where he received thousands of pilgrims from across Russia. Granted the gift of clairvoyance, the wonder-working Saint Seraphim of Sarov gave consolation and guidance to all. Saint Seraphim died on January 2, 1833, while kneeling before an icon of the Theotokos.
Source : http://www.fatheralexander.org/booklets/english/sermon_st_seraphim.htm