After the close of his northern campaign he returned to his former home to engage in agricultural pursuits. But while thus engaged he little anticipated the designs of Providence concerning him. Improving his leisure hours, he had made considerable progress in the study of theology. At length he selected his text, and composed a sermon, without education or teacher. It happened thus: In the family of Deacon Rose, the evening preceding the Sabbath was customarily devoted to family instruction and religious worship. Haynes was occasionally asked to read from the sermons of Watts, Whitefield, Doddridge or Davies. Called upon to read as usual one evening, he slipped into the book his own sermon which he had written, and read it to the family. Greatly delighted and edified by this sermon read with unusual vivacity and feeling, Deacon Rose, who was then blind, inquired: "Lemuel, whose work is that which you have been reading? Is it Davies's sermon, or Watts's, or Whitefield's?" Haynes blushed and hesitated, but at last was obliged to confess the truth--"It's Lemuel's sermon."[4] It was then discovered that in this young man was the promise of usefulness. The community encouraged him to look forward to the Christian ministry. Referring to this, he said: "I was solicited by some to obtain a collegiate education, with a view to the gospel ministry. A door was opened for it at Dartmouth College, but I shrunk at the thought. Reverend Mr. Smith encouraged me with many others. I was at last persuaded to attend to studying the learned languages. I was invited (1779) by the Reverend Daniel Farrand, of Canaan, Connecticut, to visit him. I accordingly did. With him I resided some time, studying the Latin language."[5] How long he studied under Mr. Farrand is not known. He devoted a part of his time to belles lettres and the writing of sermons. While with Mr. Farrand, Haynes composed a poem which was surreptitiously taken from his desk and afterward delivered by a plagiarist at a certain college on the day of commencement. During these years he labored in the field to defray the expense of board and tuition, but the mind of this student underwent unusual development for which Mr. Haynes retained to the end of life a grateful remembrance of his friend and patron.