He lived for many years as a monk at the Monastery of St Cyril of White Lake, where his ascetic struggles won him the respect of his brethren. To flee from the admiration of men he moved further north to Valaam Monastery. But he still attracted the good opinion of his community, so he secretly headed still further north, planning to reach the uninhabited Solovki Island in the White Sea (a large bay of the Arctic Ocean). When he reached the coast, everyone who might take him tried to dissuade him from living in such a harsh place. He answered 'My children, I have a Master who has the power to renew the strength of the old and to enfeeble the young if He so wills. He makes the poor rich, clothes the naked, provides for the destitute and satisfies the starving with a measure of food as he fed five thousand men in the desert.'

While waiting for seasonable sailing weather he met St Germanus (July 30) who lived nearby as a hermit. Together they found a fishing boat and, casting all their trust on the Lord, made the dangerous two-day voyage and set up a hermitage on the island. It became known as a holy place, and thenceforth those living in the world knew not to settle on Solovki, or even to set foot there without good reason. After six years, St Germanus departed, and Sabbatius was left alone.

When he was old, he began to fear that he would die without receiving the life-giving Mysteries, of which he had not partaken since he left Valaam. So he returned to the mainland where he met an abbot Nathanael just as he was taking Holy Communion to a sick man. Sabbatius persuaded the abbot to hear his confession and grant him the priceless gift of Holy Communion. He then settled in a nearby chapel and made ready for his departure from this life. A wealthy merchant from Novgorod visited him to ask for his blessing. The Saint said to him, 'Spend the night here and you will see the grace of God.' The next morning the merchant came to Sabbatius' cell and found that he had reposed during the night; his cell was suffused with a beautiful scent.

The following year, St Germanus, along with St Zosimas (April 17), returned to Solovki island and founded a monastery there, which proved to be the nurturing ground of many Saints.