From childhood Fletcher had a tender conscience and a devout spirit, and was exceptionally free from fault. He says, "I think it was when I was seven years of age that I first began to feel the love of God shed abroad in my heart, and that I resolved to give myself up to Him, and to the service of His Church, if ever I should be fit for it." Years afterwards there came for him a time of spiritual conflict, of heart-searching, and deep repentance, from which he passed into the clear light of reconciliation with God through faith in Christ; but his conversion had this in common with Wesley's, that it crowned and completed the piety of his youth. In both cases conversion was a momentous, unmistakable epoch; but not by reason of any change from reckless and ungodly living. It was one of those supreme events in the history of the soul that has its foundations and beginnings long before. Its relation to the past is not, outwardly at least, one of contrast, and inwardly it is not wholly so. The continuity of the spiritual life is not broken, but rather a stage is reached where the discipline and endeavours of previous years, having served their end, pass into a larger liberty and a more abundant life. "It pleased God to reveal His Son in me," is the true account, not only of sudden conversions, properly so called, but of that last act of grace which brings devout and serious youth to the full knowledge of Him whom they have long sought, and served while yet seeking.
Fletcher's student life seems to have been wholly free from the vices which, both then and now, are too generally counted venial, or even natural and reasonable, in youth. His subsequent self-upbraidings were deep enough, but they must not be misunderstood. When he says, in a letter written to his brother in his 26th year, "My infancy was vicious, and my youth still more so," the reference is not to open, actual sins, but to that ignorance of the true Christian life which, apprehended in its full significance, appears to the regenerate conscience as the one root-evil. His confessions have little in common with those of Augustine, or Bunyan, or John Newton. The most particular allusion they contain is the following: "I formed an acquaintance with some deists, at first with the design of converting them, and afterwards with the pretence of thoroughly examining their sentiments. But my heart, like that of Balaam, was not right with God. He abandoned me, and I enrolled myself in their party. A considerable change took place in my deportment. Before, I had a form of religion, and now I lost it; but as to the state of my heart, it was precisely the same. I did not remain many weeks in this state; the Good Shepherd sought after me, a wandering sheep. Again I became professedly a Christian; that is, I resumed a regular attendance at church and the communion, and offered up frequent prayers in the name of Jesus Christ. There were also in my heart some sparks of true love to God, and some germs of genuine faith; but a connexion with worldly characters, and an undue anxiety to promote my secular interests, prevented the growth of these Christian graces."