He was sent to Oxford and admitted into Exeter College, and after a few years spent there, returned to S. Ives; and as the Parliamentary Commissioners had ejected the vicar, he was thrust in as Puritan preacher in 1657, and he then married a Margaret Sparrow of the same way of thinking.
The life of Thomas Tregoss, as given by Samuel Clark in his Lives of Some Eminent Persons, 1683, is interspersed with Remarkable Providences and Extraordinary Judgments, but for the most part they are neither remarkable nor interesting.
The following is, perhaps, an exception:—
Shortly after his arrival at S. Ives, in the summer, the greater portion of the fishing season had passed without the pilchards appearing, and this to the great distress of the people. By the advice of Tregoss a day was set apart for humiliation and prayer, and next day a shoal of pilchards arrived.
In the ensuing summer the fishermen, having taken a great number of fishes on the Saturday, wanted to spread and dry their nets on the Sunday. Tregoss learning this, came forth and rebuked and denounced God's judgment on them if they should profane the "Sabbath" in this manner. They did not hearken to him, observing that their nets must be dried or would rot. From that day no more pilchards visited the bay during that season.
From S. Ives Tregoss was transferred to Mylor in October, 1659, but was ejected from the living on August 24th, 1660, as not ordained, and unwilling to receive ordination, and to subscribe to the articles and confirm to the liturgy. However, he continued to preach to a privately assembled number of puritanically minded people, and he was proceeded against and committed to the custody of the marshal in Launceston gaol, where he remained for three months, and was then released by order of the Deputy Lieutenant.
In September, 1663, he removed to Kigilliath, near Penryn. On October 1st, 1664, whilst he and his wife were lying awake in bed, they experienced an earthquake shock, and this he held to be "a symbolick image of that trembling Heartquake which he shortly felt in his conversion."
On January 1st ensuing, he fell into deep despondency and the spirit of bondage—his liver being probably out of order—till he fancied himself relieved by receiving the spirit of adoption. He had been converted half a dozen times before, but never before preceded by an earthquake, so that there could be no mistake about its reality this time.
Fired with new zeal, he broke into Mabe church at the head of a number of his adherents, mounted the pulpit, and harangued his congregation. For this he was arrested and imprisoned again in Launceston gaol, but was shortly released, July 29th, 1665; and he had the pleasing satisfaction of knowing that a bull had gored Justice Thomas Robinson, who had sent him to prison.