Thomas Wilson Bayne, Dictionary of National Biography… (1912)
“ MacGregor is a born orator. You have to listen with rapt attention to every word he says. He is equally great, too, as Guthrie was, in pulpit and on platform.' Although a staunch churchman he was considerate and tolerant when his cherished principles were not assailed, and was not without hope that divided presbyterians might ultimately recognise one inclusive Church of Scotland. MacGregor proved the most popular Scottish preacher of his day. ”
