Forasmuch as many have taken in hand to set forth in order a declaration of those things which are most surely believed among us, Many have taken in hand - Great and remarkable characters have always many biographers. So it appears it was with our Lord: but as most of these accounts were inaccurate, recording as facts things which had not happened; and through ignorance or design mistaking others, especially in the place where St. Luke wrote; it seemed good to the Holy Spirit to inspire this holy man with the most correct knowledge of the whole history of our Lord's birth, preaching, miracles, sufferings, death, resurrection, and ascension, that the sincere, upright followers of God might have a sure foundation, on which they might safely build their faith. See the note on Luke 9:10.
Most surely believed among us - Facts confirmed by the fullest evidence - των πεπληροφορημενων πραγματων. Every thing that had been done or said by Jesus Christ was so public, so plain, and so accredited by thousands of witnesses, who could have had no interest in supporting an imposture, as to carry the fullest conviction, to the hearts of those who heard and saw him, of the divinity of his doctrine, and the truth of his miracles.